CWE-319
AllowedCleartext Transmission of Sensitive Information
Abstraction: Base · Status: Draft
The product transmits sensitive or security-critical data in cleartext in a communication channel that can be sniffed by unauthorized actors.
1147 vulnerabilities reference this CWE, most recent first.
GHSA-6G22-RPP3-9GM7
Vulnerability from github – Published: 2022-05-24 19:05 – Updated: 2022-05-24 19:05When using http protocol, the user password is transmitted as a clear text parameter for which it is possible to be obtained by an attacker through a MITM attack. This will be fixed starting from Firmware version 3.11.5, which will be released on the 30th of June, 2021.
{
"affected": [],
"aliases": [
"CVE-2021-23846"
],
"database_specific": {
"cwe_ids": [
"CWE-319"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2021-06-18T14:15:00Z",
"severity": "MODERATE"
},
"details": "When using http protocol, the user password is transmitted as a clear text parameter for which it is possible to be obtained by an attacker through a MITM attack. This will be fixed starting from Firmware version 3.11.5, which will be released on the 30th of June, 2021.",
"id": "GHSA-6g22-rpp3-9gm7",
"modified": "2022-05-24T19:05:39Z",
"published": "2022-05-24T19:05:39Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-23846"
},
{
"type": "WEB",
"url": "https://psirt.bosch.com/security-advisories/bosch-sa-196933-bt.html"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-6G7P-J2Q6-FP39
Vulnerability from github – Published: 2023-02-01 15:30 – Updated: 2023-02-08 21:30Connectwise Automate 2022.11 is vulnerable to Cleartext authentication. Authentication is being done via HTTP (cleartext) with SSL disabled.
{
"affected": [],
"aliases": [
"CVE-2023-23130"
],
"database_specific": {
"cwe_ids": [
"CWE-319"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-02-01T14:15:00Z",
"severity": "MODERATE"
},
"details": "Connectwise Automate 2022.11 is vulnerable to Cleartext authentication. Authentication is being done via HTTP (cleartext) with SSL disabled.",
"id": "GHSA-6g7p-j2q6-fp39",
"modified": "2023-02-08T21:30:19Z",
"published": "2023-02-01T15:30:21Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-23130"
},
{
"type": "WEB",
"url": "https://github.com/l00neyhacker/CVE-2023-23130"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-6J6H-GW62-V4W9
Vulnerability from github – Published: 2025-06-18 21:30 – Updated: 2025-06-20 21:32An issue in CloudClassroom PHP Project v.1.0 allows a remote attacker to execute arbitrary code via the cleartext submission of passwords.
{
"affected": [],
"aliases": [
"CVE-2025-26199"
],
"database_specific": {
"cwe_ids": [
"CWE-319"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-06-18T20:15:19Z",
"severity": "CRITICAL"
},
"details": "An issue in CloudClassroom PHP Project v.1.0 allows a remote attacker to execute arbitrary code via the cleartext submission of passwords.",
"id": "GHSA-6j6h-gw62-v4w9",
"modified": "2025-06-20T21:32:06Z",
"published": "2025-06-18T21:30:30Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-26199"
},
{
"type": "WEB",
"url": "https://gist.github.com/tansique-17/6e01bb1b8a09ef499a9b8484a8dc2487"
},
{
"type": "WEB",
"url": "https://github.com/tansique-17/CVE-2025-26199/tree/main"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-6JMF-MXWF-R3JC
Vulnerability from github – Published: 2020-05-12 00:39 – Updated: 2021-06-15 17:25When Connect workers in Apache Kafka 2.0.0, 2.0.1, 2.1.0, 2.1.1, 2.2.0, 2.2.1, or 2.3.0 are configured with one or more config providers, and a connector is created/updated on that Connect cluster to use an externalized secret variable in a substring of a connector configuration property value, then any client can issue a request to the same Connect cluster to obtain the connector's task configuration and the response will contain the plaintext secret rather than the externalized secrets variables.
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 2.0.1"
},
"package": {
"ecosystem": "Maven",
"name": "org.apache.kafka:kafka"
},
"ranges": [
{
"events": [
{
"introduced": "2.0.0"
},
{
"fixed": "2.0.2"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 2.1.1"
},
"package": {
"ecosystem": "Maven",
"name": "org.apache.kafka:kafka"
},
"ranges": [
{
"events": [
{
"introduced": "2.1.0"
},
{
"fixed": "2.1.2"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 2.2.1"
},
"package": {
"ecosystem": "Maven",
"name": "org.apache.kafka:kafka"
},
"ranges": [
{
"events": [
{
"introduced": "2.2.0"
},
{
"fixed": "2.2.2"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Maven",
"name": "org.apache.kafka:kafka"
},
"ranges": [
{
"events": [
{
"introduced": "2.3.0"
},
{
"fixed": "2.3.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.3.0"
]
}
],
"aliases": [
"CVE-2019-12399"
],
"database_specific": {
"cwe_ids": [
"CWE-319"
],
"github_reviewed": true,
"github_reviewed_at": "2020-05-11T20:29:01Z",
"nvd_published_at": "2020-01-14T15:15:00Z",
"severity": "HIGH"
},
"details": "When Connect workers in Apache Kafka 2.0.0, 2.0.1, 2.1.0, 2.1.1, 2.2.0, 2.2.1, or 2.3.0 are configured with one or more config providers, and a connector is created/updated on that Connect cluster to use an externalized secret variable in a substring of a connector configuration property value, then any client can issue a request to the same Connect cluster to obtain the connector\u0027s task configuration and the response will contain the plaintext secret rather than the externalized secrets variables.",
"id": "GHSA-6jmf-mxwf-r3jc",
"modified": "2021-06-15T17:25:57Z",
"published": "2020-05-12T00:39:27Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-12399"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpujan2021.html"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuApr2021.html"
},
{
"type": "WEB",
"url": "https://www.oracle.com//security-alerts/cpujul2021.html"
},
{
"type": "WEB",
"url": "https://snyk.io/vuln/SNYK-JAVA-ORGAPACHEKAFKA-541854"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread.html/rfe90ca0463c199b99c2921410639aed53a172ea8b733eab0dc776262@%3Ccommits.druid.apache.org%3E"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread.html/rde947ee866de6687bc51cdc8dfa6d7e6b3ad4ce8c708c344f773e6dc@%3Ccommits.druid.apache.org%3E"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread.html/rda253155601968331b5cf0da4f273813bbd91843c2568a8495d1c662@%3Ccommits.kafka.apache.org%3E"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread.html/rc27d424d0bdeaf31081c3e246db3c66e882243ae3f342dfa845e0261@%3Ccommits.kafka.apache.org%3E"
},
{
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"url": "https://lists.apache.org/thread.html/r9871a4215b621c1d09deee5eba97f0f44fde01b4363deb1bed0dd160@%3Ccommits.druid.apache.org%3E"
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},
{
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"url": "https://lists.apache.org/thread.html/r6af5ed95726874e9add022955be83c192428c248d1c9a1914aff89d9@%3Cusers.kafka.apache.org%3E"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread.html/r6af5ed95726874e9add022955be83c192428c248d1c9a1914aff89d9@%3Cannounce.apache.org%3E"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread.html/r6af5ed95726874e9add022955be83c192428c248d1c9a1914aff89d9%40%3Cdev.kafka.apache.org%3E"
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{
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"url": "https://lists.apache.org/thread.html/r56eb055b544931451283fee51f7e1f5b8ebd3085fed7d77aaba504c9@%3Ccommits.druid.apache.org%3E"
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{
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},
{
"type": "WEB",
"url": "https://lists.apache.org/thread.html/r3154f5adbc905f1f9012a92240c8e00a96628470cc819453b9606d0e@%3Ccommits.druid.apache.org%3E"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread.html/r2d390dec5f360ec8aa294bef18e1a4385e2a3698d747209216f5a48b@%3Ccommits.druid.apache.org%3E"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread.html/r0e3a613705d70950aca2bfe9a6265c87503921852d9a3dbce512ca9f@%3Ccommits.druid.apache.org%3E"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2020/01/14/1"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
],
"summary": "Exposure of Sensitive Information to an Unauthorized Actor in Apache Kafka"
}
GHSA-6JWQ-8RQQ-HM8R
Vulnerability from github – Published: 2026-03-13 21:31 – Updated: 2026-03-13 21:31IBM Sterling Partner Engagement Manager 6.2.3.0 through 6.2.3.5 and 6.2.4.0 through 6.2.4.2 could allow a remote attacker to obtain sensitive information in cleartext in a communication channel that can be sniffed by unauthorized actors.
{
"affected": [],
"aliases": [
"CVE-2025-13718"
],
"database_specific": {
"cwe_ids": [
"CWE-319"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-03-13T19:53:48Z",
"severity": "LOW"
},
"details": "IBM Sterling Partner Engagement Manager 6.2.3.0 through 6.2.3.5 and 6.2.4.0 through 6.2.4.2 could allow a remote attacker to obtain sensitive information in cleartext in a communication channel that can be sniffed by unauthorized actors.",
"id": "GHSA-6jwq-8rqq-hm8r",
"modified": "2026-03-13T21:31:45Z",
"published": "2026-03-13T21:31:45Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-13718"
},
{
"type": "WEB",
"url": "https://www.ibm.com/support/pages/node/7263391"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-6MCJ-8VJ2-8VVQ
Vulnerability from github – Published: 2025-10-14 18:30 – Updated: 2025-10-14 18:30Cleartext transmission of sensitive information in Windows Hello allows an unauthorized attacker to bypass a security feature locally.
{
"affected": [],
"aliases": [
"CVE-2025-53139"
],
"database_specific": {
"cwe_ids": [
"CWE-319"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-10-14T17:15:43Z",
"severity": "HIGH"
},
"details": "Cleartext transmission of sensitive information in Windows Hello allows an unauthorized attacker to bypass a security feature locally.",
"id": "GHSA-6mcj-8vj2-8vvq",
"modified": "2025-10-14T18:30:29Z",
"published": "2025-10-14T18:30:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-53139"
},
{
"type": "WEB",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53139"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-6MPX-PMGP-WW49
Vulnerability from github – Published: 2024-12-18 00:31 – Updated: 2025-02-05 21:16Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-g6qq-c9f9-2772. This link is maintained to preserve external references.
Original Description
A vulnerability was found in Keycloak. The environment option KC_CACHE_EMBEDDED_MTLS_ENABLED does not work and the JGroups replication configuration is always used in plain text which can allow an attacker that has access to adjacent networks related to JGroups to read sensitive information.
{
"affected": [
{
"package": {
"ecosystem": "Maven",
"name": "org.keycloak:keycloak-quarkus-server"
},
"ranges": [
{
"events": [
{
"introduced": "25.0.0"
},
{
"fixed": "26.0.6"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [],
"database_specific": {
"cwe_ids": [
"CWE-319"
],
"github_reviewed": true,
"github_reviewed_at": "2024-12-18T15:40:31Z",
"nvd_published_at": "2024-12-17T23:15:05Z",
"severity": "MODERATE"
},
"details": "# Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-g6qq-c9f9-2772. This link is maintained to preserve external references.\n\n# Original Description\nA vulnerability was found in Keycloak. The environment option `KC_CACHE_EMBEDDED_MTLS_ENABLED` does not work and the JGroups replication configuration is always used in plain text which can allow an attacker that has access to adjacent networks related to JGroups to read sensitive information.",
"id": "GHSA-6mpx-pmgp-ww49",
"modified": "2025-02-05T21:16:21Z",
"published": "2024-12-18T00:31:23Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-10973"
},
{
"type": "WEB",
"url": "https://github.com/keycloak/keycloak/issues/28750"
},
{
"type": "WEB",
"url": "https://github.com/keycloak/keycloak/issues/34644"
},
{
"type": "WEB",
"url": "https://github.com/keycloak/keycloak/pull/28756"
},
{
"type": "WEB",
"url": "https://github.com/keycloak/keycloak/pull/34668"
},
{
"type": "WEB",
"url": "https://github.com/keycloak/keycloak/commit/071032a108bd9e9fce9e66d00c36d56bd4b334df"
},
{
"type": "WEB",
"url": "https://github.com/keycloak/keycloak/commit/36defd5f33b2da5d705f179bbaa21c28b13a9996"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2024-10973"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2324361"
},
{
"type": "PACKAGE",
"url": "https://github.com/keycloak/keycloak"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
],
"summary": "Duplicate Advisory: Keycloak vulnerable to Cleartext Transmission of Sensitive Information",
"withdrawn": "2025-02-05T21:16:21Z"
}
GHSA-6PJ2-4CJ6-VF8F
Vulnerability from github – Published: 2025-10-21 12:31 – Updated: 2025-11-03 18:31All WorkExaminer Professional traffic between monitoring client, console and server is transmitted as plain text. This allows an attacker with access to the network to read the transmitted sensitive data. An attacker can also freely modify the data on the wire. The monitoring clients transmit their data to the server using the unencrypted FTP. Clients connect to the FTP server on port 12304 and transmit the data unencrypted. In addition, all traffic between the console client and the server at port 12306 is unencrypted.
{
"affected": [],
"aliases": [
"CVE-2025-10641"
],
"database_specific": {
"cwe_ids": [
"CWE-319"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-10-21T12:15:35Z",
"severity": "HIGH"
},
"details": "All WorkExaminer Professional traffic between monitoring client, console and server is transmitted as plain text. This allows an attacker with access to the network to read the transmitted sensitive data. An attacker can also freely modify the data on the wire. The monitoring clients transmit their data to the server using the unencrypted FTP. Clients connect to the FTP server on port 12304 and transmit the data unencrypted. In addition, all traffic between the console client and the server at port 12306 is unencrypted.",
"id": "GHSA-6pj2-4cj6-vf8f",
"modified": "2025-11-03T18:31:46Z",
"published": "2025-10-21T12:31:27Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-10641"
},
{
"type": "WEB",
"url": "https://r.sec-consult.com/workexaminer"
},
{
"type": "WEB",
"url": "http://seclists.org/fulldisclosure/2025/Oct/19"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-6QCM-9VG4-JXV8
Vulnerability from github – Published: 2022-05-13 01:46 – Updated: 2022-05-13 01:46kpac/script.cpp in KDE kio before 5.32 and kdelibs before 4.14.30 calls the PAC FindProxyForURL function with a full https URL (potentially including Basic Authentication credentials, a query string, or PATH_INFO), which allows remote attackers to obtain sensitive information via a crafted PAC file.
{
"affected": [],
"aliases": [
"CVE-2017-6410"
],
"database_specific": {
"cwe_ids": [
"CWE-319"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2017-03-02T06:59:00Z",
"severity": "MODERATE"
},
"details": "kpac/script.cpp in KDE kio before 5.32 and kdelibs before 4.14.30 calls the PAC FindProxyForURL function with a full https URL (potentially including Basic Authentication credentials, a query string, or PATH_INFO), which allows remote attackers to obtain sensitive information via a crafted PAC file.",
"id": "GHSA-6qcm-9vg4-jxv8",
"modified": "2022-05-13T01:46:34Z",
"published": "2022-05-13T01:46:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-6410"
},
{
"type": "WEB",
"url": "https://www.kde.org/info/security/advisory-20170228-1.txt"
},
{
"type": "WEB",
"url": "http://www.debian.org/security/2017/dsa-3849"
},
{
"type": "WEB",
"url": "http://www.securityfocus.com/bid/96515"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-6QGW-MCC6-7RXW
Vulnerability from github – Published: 2024-04-03 15:30 – Updated: 2024-08-01 15:31Puwell Cloud Tech Co, Ltd 360Eyes Pro v3.9.5.16(3090516) was discovered to transmit sensitive information in cleartext. This vulnerability allows attackers to intercept and access sensitive information, including users' credentials and password change requests.
{
"affected": [],
"aliases": [
"CVE-2024-28275"
],
"database_specific": {
"cwe_ids": [
"CWE-319"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-04-03T15:15:54Z",
"severity": "MODERATE"
},
"details": "Puwell Cloud Tech Co, Ltd 360Eyes Pro v3.9.5.16(3090516) was discovered to transmit sensitive information in cleartext. This vulnerability allows attackers to intercept and access sensitive information, including users\u0027 credentials and password change requests.",
"id": "GHSA-6qgw-mcc6-7rxw",
"modified": "2024-08-01T15:31:36Z",
"published": "2024-04-03T15:30:44Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-28275"
},
{
"type": "WEB",
"url": "https://paste.sr.ht/~edaigle/0b4a037fbd3166c8c72fee18efaa7decaf75b0ab"
},
{
"type": "WEB",
"url": "https://paste.sr.ht/~edaigle/c9637d682b65e6501efb1324bba7787a2f775ff4"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
]
}
Mitigation
Before transmitting, encrypt the data using reliable, confidentiality-protecting cryptographic protocols.
Mitigation
When using web applications with SSL, use SSL for the entire session from login to logout, not just for the initial login page.
Mitigation
When designing hardware platforms, ensure that approved encryption algorithms (such as those recommended by NIST) protect paths from security critical data to trusted user applications.
Mitigation
Use tools and techniques that require manual (human) analysis, such as penetration testing, threat modeling, and interactive tools that allow the tester to record and modify an active session. These may be more effective than strictly automated techniques. This is especially the case with weaknesses that are related to design and business rules.
Mitigation
Configure servers to use encrypted channels for communication, which may include SSL or other secure protocols.
CAPEC-102: Session Sidejacking
Session sidejacking takes advantage of an unencrypted communication channel between a victim and target system. The attacker sniffs traffic on a network looking for session tokens in unencrypted traffic. Once a session token is captured, the attacker performs malicious actions by using the stolen token with the targeted application to impersonate the victim. This attack is a specific method of session hijacking, which is exploiting a valid session token to gain unauthorized access to a target system or information. Other methods to perform a session hijacking are session fixation, cross-site scripting, or compromising a user or server machine and stealing the session token.
CAPEC-117: Interception
An adversary monitors data streams to or from the target for information gathering purposes. This attack may be undertaken to solely gather sensitive information or to support a further attack against the target. This attack pattern can involve sniffing network traffic as well as other types of data streams (e.g. radio). The adversary can attempt to initiate the establishment of a data stream or passively observe the communications as they unfold. In all variants of this attack, the adversary is not the intended recipient of the data stream. In contrast to other means of gathering information (e.g., targeting data leaks), the adversary must actively position themself so as to observe explicit data channels (e.g. network traffic) and read the content. However, this attack differs from a Adversary-In-the-Middle (CAPEC-94) attack, as the adversary does not alter the content of the communications nor forward data to the intended recipient.
CAPEC-383: Harvesting Information via API Event Monitoring
An adversary hosts an event within an application framework and then monitors the data exchanged during the course of the event for the purpose of harvesting any important data leaked during the transactions. One example could be harvesting lists of usernames or userIDs for the purpose of sending spam messages to those users. One example of this type of attack involves the adversary creating an event within the sub-application. Assume the adversary hosts a "virtual sale" of rare items. As other users enter the event, the attacker records via AiTM (CAPEC-94) proxy the user_ids and usernames of everyone who attends. The adversary would then be able to spam those users within the application using an automated script.
CAPEC-477: Signature Spoofing by Mixing Signed and Unsigned Content
An attacker exploits the underlying complexity of a data structure that allows for both signed and unsigned content, to cause unsigned data to be processed as though it were signed data.
CAPEC-65: Sniff Application Code
An adversary passively sniffs network communications and captures application code bound for an authorized client. Once obtained, they can use it as-is, or through reverse-engineering glean sensitive information or exploit the trust relationship between the client and server. Such code may belong to a dynamic update to the client, a patch being applied to a client component or any such interaction where the client is authorized to communicate with the server.