CVE-2023-6840— Missing 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 Enterprise Edition（EE）是美国GitLab公司的一套内容管理系统。 GitLab Enterprise Edition 16.4到16.6.7、16.7 到16.7.5、16.8到 16.8.2版本存在安全漏洞，该漏洞源于允许维护人员绕过安全策略，更改受保护分支的名称。
Possible ATT&CK Techniques 1 AI
T1098.003 · Additional Cloud Roles
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I. Basic Information for CVE-2023-6840
Vulnerability Information
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Vulnerability Title
Missing Authorization in GitLab
Source: CVE Program / CVE List V5
Vulnerability Description
An issue has been discovered in GitLab EE affecting all versions from 16.4 prior to 16.6.7, 16.7 prior to 16.7.5, and 16.8 prior to 16.8.2 which allows a maintainer to change the name of a protected branch that bypasses the security policy added to block MR.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
GitLab Enterprise Edition 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitLab Enterprise Edition（EE）是美国GitLab公司的一套内容管理系统。 GitLab Enterprise Edition 16.4到16.6.7、16.7 到16.7.5、16.8到 16.8.2版本存在安全漏洞，该漏洞源于允许维护人员绕过安全策略，更改受保护分支的名称。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2023-6840
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2023-6840 (2)
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https://gitlab.com/gitlab-org/gitlab/-/issues/435500 issue-tracking
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Same Patch Batch · GitLab · 2024-02-07 · 3 CVEs total
| CVE-2023-6736 | 6.5 MEDIUM | Inefficient Regular Expression Complexity in GitLab |
| CVE-2024-1066 | 6.5 MEDIUM | Allocation of Resources Without Limits or Throttling in GitLab |
IV. Related Vulnerabilities
Same product: GitLab
-
CVE-2026-10053
Improper Limitation of a Pathname to a Restricted Directory -
CVE-2026-19650
Cross-Site Request Forgery (CSRF) in GitLab -
CVE-2026-19478
Improper Control of Generation of Code ('Code Injection') in -
CVE-2025-9486
Incorrect Privilege Assignment in GitLab -
CVE-2026-4879
Missing Authorization in GitLab
Same vendor: GitLab
-
CVE-2026-10053
Improper Limitation of a Pathname to a Restricted Directory -
CVE-2026-19650
Cross-Site Request Forgery (CSRF) in GitLab -
CVE-2026-19478
Improper Control of Generation of Code ('Code Injection') in -
CVE-2025-9486
Incorrect Privilege Assignment in GitLab -
CVE-2026-4879
Missing Authorization in GitLab
Same weakness: CWE-862
-
CVE-2026-39914
TIM Flow < 26.0.6 Unauthorized SQL Query Execution via Dashb -
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RansomLook Missing Authorization in Web Configuration Editor -
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Private Group and Market Posts Disclosed Through Public Noti -
CVE-2026-76847
act 0.2.81 through 0.2.89 Missing Authorization in the Artif -
CVE-2026-78372
RansomLook Missing Authorization Allows Disclosure of Privat
V. Comments for CVE-2023-6840
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