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CVE-2026-6821— 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是美国GitLab公司开源的一款源代码管理平台。 GitLab 12.0版本至19.0.6之前版本、19.1版本至19.1.4之前版本和19.2版本至19.2.2之前版本存在授权问题漏洞，该漏洞源于合并请求API端点缺少授权检查，可能导致已认证用户在特定条件下绕过基于IP的访问限制，读取私有项目的有限合并请求信息。

CVSS 4.3 · Medium EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 3

VendorProduct Version RangeStatus
GitLab GitLab 12.0< 19.0.6 affected
19.1< 19.1.4 affected
19.2< 19.2.2 affected
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I. Basic Information for CVE-2026-6821

Vulnerability Information
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Vulnerability Title
Missing 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 19.0.6, 19.1 before 19.1.4, and 19.2 before 19.2.2 that under certain conditions could have allowed an authenticated user to bypass IP-based access restrictions and read limited merge request information from a private project due to missing authorization checks in a merge requests API endpoint.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
GitLab 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitLab是美国GitLab公司开源的一款源代码管理平台。 GitLab 12.0版本至19.0.6之前版本、19.1版本至19.1.4之前版本和19.2版本至19.2.2之前版本存在授权问题漏洞，该漏洞源于合并请求API端点缺少授权检查，可能导致已认证用户在特定条件下绕过基于IP的访问限制，读取私有项目的有限合并请求信息。
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

Vendor Product Affected Versions CPE Subscribe
GitLab GitLab 12.0 ~ 19.0.6 cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-6821

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III. Intelligence Information for CVE-2026-6821

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Patches & Fixes for CVE-2026-6821 (1)

Other References for CVE-2026-6821 (1)

Same Patch Batch · GitLab · 2026-08-12 · 13 CVEs total

CVE-2026-15216 8.7 HIGH Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Gi
CVE-2026-15217 8.7 HIGH Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Gi
CVE-2026-15423 8.5 HIGH Incorrect Authorization in GitLab
CVE-2026-19228 8.5 HIGH Authorization Bypass Through User-Controlled Key in GitLab
CVE-2026-16627 7.7 HIGH Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Gi
CVE-2026-16494 7.1 HIGH Missing Authorization in GitLab
CVE-2026-7427 5.3 MEDIUM Allocation of Resources Without Limits or Throttling in GitLab
CVE-2026-18244 4.3 MEDIUM Missing Authorization in GitLab
CVE-2026-8667 4.3 MEDIUM Incorrect Authorization in GitLab
CVE-2026-18433 4.3 MEDIUM Incorrect Authorization in GitLab
CVE-2026-4879 4.3 MEDIUM Missing Authorization in GitLab
CVE-2025-9486 3.3 LOW Incorrect Privilege Assignment in GitLab

IV. Related Vulnerabilities

Same product: GitLab
Same vendor: GitLab
Same weakness: CWE-862

V. Comments for CVE-2026-6821

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