CWE-203
AllowedObservable Discrepancy
Abstraction: Base · Status: Incomplete
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.
836 vulnerabilities reference this CWE, most recent first.
GHSA-P9M4-PVG5-X6FG
Vulnerability from github – Published: 2026-07-01 00:34 – Updated: 2026-07-01 15:35Side-channel information leakage in WebAudio in Google Chrome prior to 150.0.7871.47 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Low)
{
"affected": [],
"aliases": [
"CVE-2026-14071"
],
"database_specific": {
"cwe_ids": [
"CWE-1300",
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-30T23:17:19Z",
"severity": "MODERATE"
},
"details": "Side-channel information leakage in WebAudio in Google Chrome prior to 150.0.7871.47 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Low)",
"id": "GHSA-p9m4-pvg5-x6fg",
"modified": "2026-07-01T15:35:08Z",
"published": "2026-07-01T00:34:10Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-14071"
},
{
"type": "WEB",
"url": "https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop_0175352312.html"
},
{
"type": "WEB",
"url": "https://issues.chromium.org/issues/506143724"
}
],
"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"
}
]
}
GHSA-P9W8-99J3-73RV
Vulnerability from github – Published: 2022-05-24 16:56 – Updated: 2024-04-04 01:58RSA BSAFE Crypto-J versions prior to 6.2.5 are vulnerable to Information Exposure Through Timing Discrepancy vulnerabilities during ECDSA key generation. A malicious remote attacker could potentially exploit those vulnerabilities to recover ECDSA keys.
{
"affected": [],
"aliases": [
"CVE-2019-3739"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2019-09-18T23:15:00Z",
"severity": "MODERATE"
},
"details": "RSA BSAFE Crypto-J versions prior to 6.2.5 are vulnerable to Information Exposure Through Timing Discrepancy vulnerabilities during ECDSA key generation. A malicious remote attacker could potentially exploit those vulnerabilities to recover ECDSA keys.",
"id": "GHSA-p9w8-99j3-73rv",
"modified": "2024-04-04T01:58:25Z",
"published": "2022-05-24T16:56:30Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-3739"
},
{
"type": "WEB",
"url": "https://www.dell.com/support/security/en-us/details/DOC-106556/DSA-2019-094-RSA-BSAFE\u0026#174%3B-Crypto-J-Multiple-Security-Vulnerabilities"
},
{
"type": "WEB",
"url": "https://www.dell.com/support/security/en-us/details/DOC-106556/DSA-2019-094-RSA-BSAFE\u0026#174;-Crypto-J-Multiple-Security-Vulnerabilities"
},
{
"type": "WEB",
"url": "https://www.oracle.com//security-alerts/cpujul2021.html"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuApr2021.html"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpujul2020.html"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuoct2020.html"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
}
],
"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"
}
]
}
GHSA-PC2Q-2R77-C6MP
Vulnerability from github – Published: 2025-01-11 09:30 – Updated: 2025-05-16 15:30HCL MyXalytics is affected by username enumeration vulnerability. This allows a malicious user to perform enumeration of application users, and therefore compile a list of valid usernames.
{
"affected": [],
"aliases": [
"CVE-2024-42174"
],
"database_specific": {
"cwe_ids": [
"CWE-203",
"CWE-204"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-01-11T07:15:09Z",
"severity": "LOW"
},
"details": "HCL MyXalytics is affected by username enumeration vulnerability. This allows a malicious user to perform enumeration of application users, and therefore\u00a0compile a list of valid usernames.",
"id": "GHSA-pc2q-2r77-c6mp",
"modified": "2025-05-16T15:30:32Z",
"published": "2025-01-11T09:30:30Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-42174"
},
{
"type": "WEB",
"url": "https://support.hcl-software.com/csm?id=kb_article\u0026sysparm_article=KB0118149"
}
],
"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-PCXG-VCF2-RP56
Vulnerability from github – Published: 2026-02-19 21:30 – Updated: 2026-02-19 21:30GFI MailEssentials AI versions prior to 22.4 contain an arbitrary directory existence enumeration vulnerability in the ListServer.IsPathExist() web method exposed at /MailEssentials/pages/MailSecurity/ListServer.aspx/IsPathExist. An authenticated user can supply an unrestricted filesystem path via the JSON key \"path\", which is URL-decoded and passed to Directory.Exists(), allowing the attacker to determine whether arbitrary directories exist on the server.
{
"affected": [],
"aliases": [
"CVE-2026-23621"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-02-19T19:22:28Z",
"severity": "MODERATE"
},
"details": "GFI MailEssentials AI versions prior to\u00a022.4 contain an arbitrary directory existence enumeration vulnerability in the ListServer.IsPathExist() web method exposed at /MailEssentials/pages/MailSecurity/ListServer.aspx/IsPathExist. An authenticated user can supply an unrestricted filesystem path via the JSON key \\\"path\\\", which is URL-decoded and passed to Directory.Exists(), allowing the attacker to determine whether arbitrary directories exist on the server.",
"id": "GHSA-pcxg-vcf2-rp56",
"modified": "2026-02-19T21:30:47Z",
"published": "2026-02-19T21:30:47Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23621"
},
{
"type": "WEB",
"url": "https://gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resources/documentation/product-releases"
},
{
"type": "WEB",
"url": "https://www.vulncheck.com/advisories/gfi-mailessentials-ai-listserver-ispathexist-absolute-directory-traversal-to-file-enumeration"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
]
}
GHSA-PGJW-XWMC-8P56
Vulnerability from github – Published: 2026-06-05 00:31 – Updated: 2026-06-05 21:32Side-channel information leakage in Paint in Google Chrome prior to 149.0.7827.53 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Low)
{
"affected": [],
"aliases": [
"CVE-2026-11289"
],
"database_specific": {
"cwe_ids": [
"CWE-1300",
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-05T00:17:06Z",
"severity": "MODERATE"
},
"details": "Side-channel information leakage in Paint in Google Chrome prior to 149.0.7827.53 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Low)",
"id": "GHSA-pgjw-xwmc-8p56",
"modified": "2026-06-05T21:32:03Z",
"published": "2026-06-05T00:31:55Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-11289"
},
{
"type": "WEB",
"url": "https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop.html"
},
{
"type": "WEB",
"url": "https://issues.chromium.org/issues/502239897"
}
],
"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"
}
]
}
GHSA-PGQ5-F878-VWPF
Vulnerability from github – Published: 2022-05-24 17:10 – Updated: 2022-05-24 17:10An exploitable timing discrepancy vulnerability exists in the authentication functionality of the Web-Based Management (WBM) web application on WAGO PFC100/200 controllers. The WBM application makes use of the PHP crypt() function which can be exploited to disclose hashed user credentials. This affects WAGO PFC200 Firmware version 03.00.39(12) and version 03.01.07(13), and WAGO PFC100 Firmware version 03.00.39(12).
{
"affected": [],
"aliases": [
"CVE-2019-5135"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2020-03-11T22:27:00Z",
"severity": "MODERATE"
},
"details": "An exploitable timing discrepancy vulnerability exists in the authentication functionality of the Web-Based Management (WBM) web application on WAGO PFC100/200 controllers. The WBM application makes use of the PHP crypt() function which can be exploited to disclose hashed user credentials. This affects WAGO PFC200 Firmware version 03.00.39(12) and version 03.01.07(13), and WAGO PFC100 Firmware version 03.00.39(12).",
"id": "GHSA-pgq5-f878-vwpf",
"modified": "2022-05-24T17:10:48Z",
"published": "2022-05-24T17:10:48Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-5135"
},
{
"type": "WEB",
"url": "https://talosintelligence.com/vulnerability_reports/TALOS-2019-0924"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-PGQQ-QJ76-FFFJ
Vulnerability from github – Published: 2021-12-16 00:00 – Updated: 2021-12-18 00:01In setNotificationsShownFromListener of NotificationManagerService.java, there is a possible way to determine whether an app is installed, without query permissions, due to side channel information disclosure. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-12Android ID: A-194697001
{
"affected": [],
"aliases": [
"CVE-2021-1030"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2021-12-15T19:15:00Z",
"severity": "MODERATE"
},
"details": "In setNotificationsShownFromListener of NotificationManagerService.java, there is a possible way to determine whether an app is installed, without query permissions, due to side channel information disclosure. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-12Android ID: A-194697001",
"id": "GHSA-pgqq-qj76-fffj",
"modified": "2021-12-18T00:01:11Z",
"published": "2021-12-16T00:00:50Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-1030"
},
{
"type": "WEB",
"url": "https://source.android.com/security/bulletin/pixel/2021-12-01"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-PH37-2CQR-GFC5
Vulnerability from github – Published: 2025-09-30 18:30 – Updated: 2025-09-30 18:30Improper handling of authentication requests lead to a user enumeration vector in the passkey authentication method.
{
"affected": [],
"aliases": [
"CVE-2025-54477"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-30T16:15:52Z",
"severity": "MODERATE"
},
"details": "Improper handling of authentication requests lead to a user enumeration vector in the passkey authentication method.",
"id": "GHSA-ph37-2cqr-gfc5",
"modified": "2025-09-30T18:30:24Z",
"published": "2025-09-30T18:30:24Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-54477"
},
{
"type": "WEB",
"url": "https://developer.joomla.org/security-centre/1011-20250902-core-user-enumeration-in-passkey-authentication-method.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-PHF3-25C6-93HV
Vulnerability from github – Published: 2024-01-30 18:30 – Updated: 2024-01-30 18:30A security vulnerability has been identified in the pkcs11-provider, which is associated with Public-Key Cryptography Standards (PKCS#11). If exploited successfully, this vulnerability could result in a Bleichenbacher-like security flaw, potentially enabling a side-channel attack on PKCS#1 1.5 decryption.
{
"affected": [],
"aliases": [
"CVE-2023-6258"
],
"database_specific": {
"cwe_ids": [
"CWE-1300",
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-01-30T17:15:10Z",
"severity": "HIGH"
},
"details": "A security vulnerability has been identified in the pkcs11-provider, which is associated with Public-Key Cryptography Standards (PKCS#11). If exploited successfully, this vulnerability could result in a Bleichenbacher-like security flaw, potentially enabling a side-channel attack on PKCS#1 1.5 decryption.",
"id": "GHSA-phf3-25c6-93hv",
"modified": "2024-01-30T18:30:20Z",
"published": "2024-01-30T18:30:20Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-6258"
},
{
"type": "WEB",
"url": "https://github.com/latchset/pkcs11-provider/pull/308"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2251062"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-PJ6M-JC6G-72C4
Vulnerability from github – Published: 2022-03-11 00:02 – Updated: 2022-03-17 00:01The pointer-validation logic in util/mem_util.rs in Occlum before 0.26.0 for Intel SGX acts as a confused deputy that allows a local attacker to access unauthorized information via side-channel analysis.
{
"affected": [],
"aliases": [
"CVE-2021-44421"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2022-03-10T17:44:00Z",
"severity": "MODERATE"
},
"details": "The pointer-validation logic in util/mem_util.rs in Occlum before 0.26.0 for Intel SGX acts as a confused deputy that allows a local attacker to access unauthorized information via side-channel analysis.",
"id": "GHSA-pj6m-jc6g-72c4",
"modified": "2022-03-17T00:01:43Z",
"published": "2022-03-11T00:02:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-44421"
},
{
"type": "WEB",
"url": "https://github.com/occlum/occlum/commit/36918e42bf6732c4d3996bc99eb013eb6b90b249"
},
{
"type": "WEB",
"url": "https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L130"
},
{
"type": "WEB",
"url": "https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L51"
},
{
"type": "WEB",
"url": "https://github.com/occlum/occlum/compare/0.25.0...v0.26.0"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
]
}
Mitigation MIT-46
Strategy: Separation of Privilege
- Compartmentalize the system to have "safe" areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
- Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
Mitigation MIT-39
- Ensure that error messages only contain minimal details that are useful to the intended audience and no one else. The messages need to strike the balance between being too cryptic (which can confuse users) or being too detailed (which may reveal more than intended). The messages should not reveal the methods that were used to determine the error. Attackers can use detailed information to refine or optimize their original attack, thereby increasing their chances of success.
- If errors must be captured in some detail, record them in log messages, but consider what could occur if the log messages can be viewed by attackers. Highly sensitive information such as passwords should never be saved to log files.
- Avoid inconsistent messaging that might accidentally tip off an attacker about internal state, such as whether a user account exists or not.
CAPEC-189: Black Box Reverse Engineering
An adversary discovers the structure, function, and composition of a type of computer software through black box analysis techniques. 'Black Box' methods involve interacting with the software indirectly, in the absence of direct access to the executable object. Such analysis typically involves interacting with the software at the boundaries of where the software interfaces with a larger execution environment, such as input-output vectors, libraries, or APIs. Black Box Reverse Engineering also refers to gathering physical side effects of a hardware device, such as electromagnetic radiation or sounds.