CWE-307
AllowedImproper Restriction of Excessive Authentication Attempts
Abstraction: Base · Status: Draft
The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame.
1024 vulnerabilities reference this CWE, most recent first.
GHSA-H64J-VRF9-JPC3
Vulnerability from github – Published: 2026-08-16 00:31 – Updated: 2026-08-16 00:31SiYuan before 3.7.4 contains an improper restriction of excessive authentication attempts vulnerability in the authFilePublishAccess endpoint that allows unauthenticated attackers to brute-force per-notebook publish passwords. Attackers can submit unbounded password guesses without rate limiting or CAPTCHA to gain access to password-protected published notebooks.
{
"affected": [],
"aliases": [
"CVE-2026-73045"
],
"database_specific": {
"cwe_ids": [
"CWE-307"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T22:16:54Z",
"severity": "HIGH"
},
"details": "SiYuan before 3.7.4 contains an improper restriction of excessive authentication attempts vulnerability in the authFilePublishAccess endpoint that allows unauthenticated attackers to brute-force per-notebook publish passwords. Attackers can submit unbounded password guesses without rate limiting or CAPTCHA to gain access to password-protected published notebooks.",
"id": "GHSA-h64j-vrf9-jpc3",
"modified": "2026-08-16T00:31:27Z",
"published": "2026-08-16T00:31:27Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-v362-968x-gp2v"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73045"
},
{
"type": "WEB",
"url": "https://www.vulncheck.com/advisories/siyuan-before-brute-force-via-authfilepublishaccess"
}
],
"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"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/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-H6HJ-8QX6-P2FM
Vulnerability from github – Published: 2026-08-13 21:36 – Updated: 2026-08-13 21:36IBM Langflow OSS 1.0.0 through 1.9.6 could allow a remote attacker to obtain unauthorized access to user accounts due to improper restriction of excessive authentication attempts.
{
"affected": [],
"aliases": [
"CVE-2026-19297"
],
"database_specific": {
"cwe_ids": [
"CWE-307"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-13T21:17:45Z",
"severity": "CRITICAL"
},
"details": "IBM Langflow OSS 1.0.0 through 1.9.6 could allow a remote attacker to obtain unauthorized access to user accounts due to improper restriction of excessive authentication attempts.",
"id": "GHSA-h6hj-8qx6-p2fm",
"modified": "2026-08-13T21:36:14Z",
"published": "2026-08-13T21:36:13Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19297"
},
{
"type": "WEB",
"url": "https://www.ibm.com/support/pages/node/7283558"
}
],
"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:N",
"type": "CVSS_V3"
}
]
}
GHSA-H6R2-PGVX-683C
Vulnerability from github – Published: 2022-05-24 19:11 – Updated: 2026-06-10 18:45Improper Authentication in Lin-CMS-Flask v0.1.1 allows remote attackers to launch brute force login attempts without restriction via the 'login' function in the component app/api/cms/user.py.
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "Lin-CMS"
},
"versions": [
"0.1.1"
]
}
],
"aliases": [
"CVE-2020-18698"
],
"database_specific": {
"cwe_ids": [
"CWE-307"
],
"github_reviewed": true,
"github_reviewed_at": "2024-05-01T16:45:58Z",
"nvd_published_at": "2021-08-16T18:15:00Z",
"severity": "CRITICAL"
},
"details": "Improper Authentication in Lin-CMS-Flask v0.1.1 allows remote attackers to launch brute force login attempts without restriction via the \u0027login\u0027 function in the component `app/api/cms/user.py`.",
"id": "GHSA-h6r2-pgvx-683c",
"modified": "2026-06-10T18:45:05Z",
"published": "2022-05-24T19:11:15Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-18698"
},
{
"type": "WEB",
"url": "https://github.com/TaleLin/lin-cms-flask/issues/27"
},
{
"type": "WEB",
"url": "https://cwe.mitre.org/data/definitions/307.html"
},
{
"type": "PACKAGE",
"url": "https://github.com/TaleLin/lin-cms-flask"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/lin-cms/PYSEC-2021-339.yaml"
}
],
"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"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Lin-CMS-Flask vulnerable to Improper Authentication"
}
GHSA-H7JX-W3WH-PW57
Vulnerability from github – Published: 2023-03-23 21:30 – Updated: 2023-03-30 18:30Zoho ManageEngine ADSelfService Plus through 6203 is vulnerable to a brute-force attack that leads to a password reset on IDM applications.
{
"affected": [],
"aliases": [
"CVE-2022-36413"
],
"database_specific": {
"cwe_ids": [
"CWE-307"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-03-23T20:15:00Z",
"severity": "CRITICAL"
},
"details": "Zoho ManageEngine ADSelfService Plus through 6203 is vulnerable to a brute-force attack that leads to a password reset on IDM applications.",
"id": "GHSA-h7jx-w3wh-pw57",
"modified": "2023-03-30T18:30:33Z",
"published": "2023-03-23T21:30:20Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-36413"
},
{
"type": "WEB",
"url": "https://www.manageengine.com/products/self-service-password/advisory/CVE-2022-36413.html"
}
],
"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:N",
"type": "CVSS_V3"
}
]
}
GHSA-H7M5-VJWP-2JFX
Vulnerability from github – Published: 2025-10-27 15:30 – Updated: 2025-10-27 15:30Unexpected authentication form rendering in HTML Form Adapter using only non-default redirectless mode in PingFederate allows authentication attempts which may enable brute force login attacks.
{
"affected": [],
"aliases": [
"CVE-2025-26862"
],
"database_specific": {
"cwe_ids": [
"CWE-307"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-10-27T15:15:37Z",
"severity": "LOW"
},
"details": "Unexpected authentication form rendering in HTML Form Adapter using only non-default redirectless mode in PingFederate allows authentication attempts which may enable brute force login attacks.",
"id": "GHSA-h7m5-vjwp-2jfx",
"modified": "2025-10-27T15:30:42Z",
"published": "2025-10-27T15:30:42Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-26862"
},
{
"type": "WEB",
"url": "https://support.pingidentity.com/s/article/PingFederate-unexpected-template-rendering-in-redirectless-mode"
},
{
"type": "WEB",
"url": "https://www.pingidentity.com/en/resources/downloads/pingfederate.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:P/VC:N/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:P/AU:Y/R:X/V:X/RE:L/U:Amber",
"type": "CVSS_V4"
}
]
}
GHSA-H94G-97QR-74VM
Vulnerability from github – Published: 2023-12-05 00:31 – Updated: 2024-08-01 15:31A client side rate limit issue discovered in Connectize AC21000 G6 641.139.1.1256 allows attackers to gain escalated privileges via brute force style attacks.
{
"affected": [],
"aliases": [
"CVE-2023-24051"
],
"database_specific": {
"cwe_ids": [
"CWE-307",
"CWE-863"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-12-04T23:15:23Z",
"severity": "CRITICAL"
},
"details": "A client side rate limit issue discovered in Connectize AC21000 G6 641.139.1.1256 allows attackers to gain escalated privileges via brute force style attacks.",
"id": "GHSA-h94g-97qr-74vm",
"modified": "2024-08-01T15:31:25Z",
"published": "2023-12-05T00:31:07Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-24051"
},
{
"type": "WEB",
"url": "https://research.nccgroup.com/2023/10/19/technical-advisory-multiple-vulnerabilities-in-connectize-g6-ac2100-dual-band-gigabit-wifi-router-cve-2023-24046-cve-2023-24047-cve-2023-24048-cve-2023-24049-cve-2023-24050-cve-2023-24051-cve"
}
],
"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-HC8R-P4JW-P6FR
Vulnerability from github – Published: 2026-06-22 15:30 – Updated: 2026-06-22 15:30AIL did not restrict repeated failed attempts to verify a two-factor authentication (OTP) code. An attacker who had reached the 2FA verification step, such as after successfully completing the password-authentication stage, could submit an unlimited number of OTP guesses. This could enable brute-force guessing of a valid code and bypass the intended second authentication factor, resulting in unauthorized account access.
The patch introduces per-user failed-OTP tracking, blocks verification after 30 failed attempts for one hour, clears the counter after a successful OTP verification, and provides administrator recovery actions to purge affected lockouts.
{
"affected": [],
"aliases": [
"CVE-2026-56450"
],
"database_specific": {
"cwe_ids": [
"CWE-307"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-22T14:17:50Z",
"severity": "MODERATE"
},
"details": "AIL did not restrict repeated failed attempts to verify a two-factor authentication (OTP) code. An attacker who had reached the 2FA verification step, such as after successfully completing the password-authentication stage, could submit an unlimited number of OTP guesses. This could enable brute-force guessing of a valid code and bypass the intended second authentication factor, resulting in unauthorized account access.\n\n\nThe patch introduces per-user failed-OTP tracking, blocks verification after 30 failed attempts for one hour, clears the counter after a successful OTP verification, and provides administrator recovery actions to purge affected lockouts.",
"id": "GHSA-hc8r-p4jw-p6fr",
"modified": "2026-06-22T15:30:45Z",
"published": "2026-06-22T15:30:45Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56450"
},
{
"type": "WEB",
"url": "https://github.com/ail-project/ail-framework/commit/d3a394fe68fd5aeee86f3a3c91d4a0350f91e974"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/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-HCHV-VV89-9PXP
Vulnerability from github – Published: 2022-10-17 19:00 – Updated: 2022-10-19 19:00An issue has been discovered in GitLab CE/EE affecting all versions before 15.1.6, all versions starting from 15.2 before 15.2.4, all versions starting from 15.3 before 15.3.2. It may be possible for an attacker to guess a user's password by brute force by sending crafted requests to a specific endpoint, even if the victim user has 2FA enabled on their account.
{
"affected": [],
"aliases": [
"CVE-2022-3031"
],
"database_specific": {
"cwe_ids": [
"CWE-307"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2022-10-17T16:15:00Z",
"severity": "HIGH"
},
"details": "An issue has been discovered in GitLab CE/EE affecting all versions before 15.1.6, all versions starting from 15.2 before 15.2.4, all versions starting from 15.3 before 15.3.2. It may be possible for an attacker to guess a user\u0027s password by brute force by sending crafted requests to a specific endpoint, even if the victim user has 2FA enabled on their account.",
"id": "GHSA-hchv-vv89-9pxp",
"modified": "2022-10-19T19:00:22Z",
"published": "2022-10-17T19:00:27Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-3031"
},
{
"type": "WEB",
"url": "https://gitlab.com/gitlab-org/cves/-/blob/master/2022/CVE-2022-3031.json"
},
{
"type": "WEB",
"url": "https://gitlab.com/gitlab-org/gitlab/-/issues/340395"
}
],
"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"
}
]
}
GHSA-HF62-5VXH-JPWJ
Vulnerability from github – Published: 2022-05-24 17:01 – Updated: 2023-08-01 23:40Pimcore before 6.2.2 lacks brute force protection for the 2FA token.
{
"affected": [
{
"package": {
"ecosystem": "Packagist",
"name": "pimcore/pimcore"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "6.2.2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2019-18985"
],
"database_specific": {
"cwe_ids": [
"CWE-307"
],
"github_reviewed": true,
"github_reviewed_at": "2023-08-01T23:40:34Z",
"nvd_published_at": "2019-11-15T05:15:00Z",
"severity": "CRITICAL"
},
"details": "Pimcore before 6.2.2 lacks brute force protection for the 2FA token.",
"id": "GHSA-hf62-5vxh-jpwj",
"modified": "2023-08-01T23:40:34Z",
"published": "2022-05-24T17:01:23Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-18985"
},
{
"type": "WEB",
"url": "https://github.com/pimcore/pimcore/commit/9f2d075243a8392c114d9a8028858b9faf041e2d"
},
{
"type": "WEB",
"url": "https://github.com/pimcore/pimcore/compare/v6.2.1...v6.2.2"
}
],
"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"
}
],
"summary": "Pimcore 2FA Vulnerable to Brute Forcing"
}
GHSA-HFHH-3VVV-4GQF
Vulnerability from github – Published: 2022-05-24 17:35 – Updated: 2022-05-24 17:35An issue was discovered in Bitrix24 Bitrix Framework (1c site management) 20.0. An "User enumeration and Improper Restriction of Excessive Authentication Attempts" vulnerability exists in the admin login form, allowing a remote user to enumerate users in the administrator group. This also allows brute-force attacks on the passwords of users not in the administrator group.
{
"affected": [],
"aliases": [
"CVE-2020-28206"
],
"database_specific": {
"cwe_ids": [
"CWE-307"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2020-12-02T19:15:00Z",
"severity": "MODERATE"
},
"details": "An issue was discovered in Bitrix24 Bitrix Framework (1c site management) 20.0. An \"User enumeration and Improper Restriction of Excessive Authentication Attempts\" vulnerability exists in the admin login form, allowing a remote user to enumerate users in the administrator group. This also allows brute-force attacks on the passwords of users not in the administrator group.",
"id": "GHSA-hfhh-3vvv-4gqf",
"modified": "2022-05-24T17:35:12Z",
"published": "2022-05-24T17:35:12Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-28206"
},
{
"type": "WEB",
"url": "https://justrealstag.medium.com/user-enumeration-improper-restriction-of-excessive-authentication-attempts-in-bitrix-98933a97e0e6"
}
],
"schema_version": "1.4.0",
"severity": []
}
Mitigation
- Common protection mechanisms include:
- Disconnecting the user after a small number of failed attempts
- Implementing a timeout
- Locking out a targeted account
- Requiring a computational task on the user's part.
Mitigation MIT-4
Strategy: Libraries or Frameworks
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482].
- Consider using libraries with authentication capabilities such as OpenSSL or the ESAPI Authenticator. [REF-45]
CAPEC-16: Dictionary-based Password Attack
An attacker tries each of the words in a dictionary as passwords to gain access to the system via some user's account. If the password chosen by the user was a word within the dictionary, this attack will be successful (in the absence of other mitigations). This is a specific instance of the password brute forcing attack pattern.
Dictionary Attacks differ from similar attacks such as Password Spraying (CAPEC-565) and Credential Stuffing (CAPEC-600), since they leverage unknown username/password combinations and don't care about inducing account lockouts.
CAPEC-49: Password Brute Forcing
An adversary tries every possible value for a password until they succeed. A brute force attack, if feasible computationally, will always be successful because it will essentially go through all possible passwords given the alphabet used (lower case letters, upper case letters, numbers, symbols, etc.) and the maximum length of the password.
CAPEC-560: Use of Known Domain Credentials
An adversary guesses or obtains (i.e. steals or purchases) legitimate credentials (e.g. userID/password) to achieve authentication and to perform authorized actions under the guise of an authenticated user or service.
CAPEC-565: Password Spraying
In a Password Spraying attack, an adversary tries a small list (e.g. 3-5) of common or expected passwords, often matching the target's complexity policy, against a known list of user accounts to gain valid credentials. The adversary tries a particular password for each user account, before moving onto the next password in the list. This approach assists the adversary in remaining undetected by avoiding rapid or frequent account lockouts. The adversary may then reattempt the process with additional passwords, once enough time has passed to prevent inducing a lockout.
CAPEC-600: Credential Stuffing
An adversary tries known username/password combinations against different systems, applications, or services to gain additional authenticated access. Credential Stuffing attacks rely upon the fact that many users leverage the same username/password combination for multiple systems, applications, and services.
CAPEC-652: Use of Known Kerberos Credentials
An adversary obtains (i.e. steals or purchases) legitimate Kerberos credentials (e.g. Kerberos service account userID/password or Kerberos Tickets) with the goal of achieving authenticated access to additional systems, applications, or services within the domain.
CAPEC-653: Use of Known Operating System Credentials
An adversary guesses or obtains (i.e. steals or purchases) legitimate operating system credentials (e.g. userID/password) to achieve authentication and to perform authorized actions on the system, under the guise of an authenticated user or service. This applies to any Operating System.