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CVE-2026-2104— Authorization Bypass Through User-Controlled Key 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公司的一个端到端软件开发平台，具有内置的版本控制、问题跟踪、代码审查、CI/CD（持续集成和持续交付）等功能。 GitLab CE/EE 18.8.9之前版本、18.9.5之前版本和18.10.3之前版本存在安全漏洞，该漏洞源于授权检查不足，可能导致经过身份验证的用户通过CSV导出访问分配给其他用户的机密问题。

CVSS 4.3 · Medium EPSS 0.31% · P21

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-2104

Vulnerability Information
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Vulnerability Title
Authorization Bypass Through User-Controlled Key in GitLab
Source: CVE Program / CVE List V5
Vulnerability Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.2 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3 that could have allowed an authenticated user to access confidential issues assigned to other users via CSV export due to insufficient authorization checks.
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
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
GitLab 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitLab是美国GitLab公司的一个端到端软件开发平台，具有内置的版本控制、问题跟踪、代码审查、CI/CD（持续集成和持续交付）等功能。 GitLab CE/EE 18.8.9之前版本、18.9.5之前版本和18.10.3之前版本存在安全漏洞，该漏洞源于授权检查不足，可能导致经过身份验证的用户通过CSV导出访问分配给其他用户的机密问题。
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 18.2 ~ 18.8.9 cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-2104

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III. Intelligence Information for CVE-2026-2104

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Patches & Fixes for CVE-2026-2104 (1)

Same Patch Batch · GitLab · 2026-04-08 · 11 CVEs total

CVE-2026-5173 8.5 HIGH Exposed Dangerous Method or Function in GitLab
CVE-2026-1092 7.5 HIGH Improper Validation of Specified Quantity in Input in GitLab
CVE-2025-12664 7.5 HIGH Improper Validation of Specified Quantity in Input in GitLab
CVE-2026-1101 6.5 MEDIUM Improper Validation of Specified Quantity in Input in GitLab
CVE-2026-1516 5.7 MEDIUM Improper Control of Generation of Code ('Code Injection') in GitLab
CVE-2026-4332 5.4 MEDIUM Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Gi
CVE-2026-2619 4.3 MEDIUM Incorrect Authorization in GitLab
CVE-2026-1752 4.3 MEDIUM Incorrect Authorization in GitLab
CVE-2025-9484 4.3 MEDIUM Missing Authorization in GitLab
CVE-2026-4916 2.7 LOW Missing Authorization in GitLab

IV. Related Vulnerabilities

Same product: GitLab
Same vendor: GitLab
Same weakness: CWE-639

V. Comments for CVE-2026-2104

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