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CVE-2026-5173— Exposed Dangerous Method or Function 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存在安全漏洞，该漏洞源于访问控制不当，可能导致通过websocket连接调用非预期的服务器端方法。以下版本受到影响：GitLab CE/EE 18.8.9之前版本的16.9.6至18.8版本、18.9.5之前版本的18.9版本和18.10.3之前版本的18.10版本。

CVSS 8.5 · High EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-5173

Vulnerability Information
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Vulnerability Title
Exposed Dangerous Method or Function in GitLab
Source: CVE Program / CVE List V5
Vulnerability Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9.6 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 invoke unintended server-side methods through websocket connections due to improper access control.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
暴露危险的方法或函数
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存在安全漏洞，该漏洞源于访问控制不当，可能导致通过websocket连接调用非预期的服务器端方法。以下版本受到影响：GitLab CE/EE 18.8.9之前版本的16.9.6至18.8版本、18.9.5之前版本的18.9版本和18.10.3之前版本的18.10版本。
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 16.9.6 ~ 18.8.9 cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-5173

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III. Intelligence Information for CVE-2026-5173

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Patches & Fixes for CVE-2026-5173 (1)

Other References for CVE-2026-5173 (1)

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

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-2026-2104 4.3 MEDIUM Authorization Bypass Through User-Controlled Key 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-749

V. Comments for CVE-2026-5173

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