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CVE-2026-16255— Incorrect Authorization in GitLab

Quick assessment

Affected
GitLab GitLab
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GitLab 已修复 GitLab EE 中的一个问题，该问题影响 12.0 至 19.3.6 之前的所有版本、19.4 至 19.4.3 之前的版本，以及 19.5 至 19.5.1 之前的版本。当启用实例级别的 SAML 或 LDAP 成员锁定功能时，由于对启用锁定之前创建的请求未完全执行成员锁定策略，已认证用户可能绕过身份提供商的控制，自行授予或接受项目与群组成员身份。

CVSS 5.9 · Medium
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I. Basic Information for CVE-2026-16255

Vulnerability Information
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Vulnerability Title
Incorrect Authorization in GitLab
Source: CVE Program / CVE List V5
Vulnerability Description
GitLab has remediated an issue in GitLab EE affecting all versions from 12.0 before 19.3.6, 19.4 before 19.4.3, and 19.5 before 19.5.1 that, when the instance-wide SAML or LDAP membership lock was enabled, an authenticated user could have granted or accepted project and group membership outside the identity provider's control, due to incomplete enforcement of the membership lock on requests created before the lock was enabled.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
GitLab GitLab 12.0 ~ 19.3.6 cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-16255

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III. Intelligence Information for CVE-2026-16255

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Other References for CVE-2026-16255 (1)

Same Patch Batch · GitLab · 2026-10-21 · 11 CVEs total

CVE-2026-15723 8.2 HIGH Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection') in Gi
CVE-2026-112212 7.5 HIGH Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') in GitLab
CVE-2026-12664 6.8 MEDIUM Incorrect Authorization in GitLab
CVE-2026-13319 4.3 MEDIUM Authorization Bypass Through User-Controlled Key in GitLab
CVE-2026-105777 4.3 MEDIUM Insertion of Sensitive Information Into Sent Data in GitLab
CVE-2026-112378 4.3 MEDIUM Use of Less Trusted Source in GitLab
CVE-2026-105711 3.5 LOW Use of Cache Containing Sensitive Information in GitLab
CVE-2026-14288 3.1 LOW Use of Incorrectly-Resolved Name or Reference in GitLab
CVE-2026-112326 3.1 LOW Improper Cleanup on Thrown Exception in GitLab
CVE-2026-103515 2.7 LOW Incorrect Authorization in GitLab

IV. Related Vulnerabilities

Same product: GitLab
Same vendor: GitLab
Same weakness: CWE-863

V. Comments for CVE-2026-16255

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