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CVE-2026-2973— Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') 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 18.8.7之前版本、18.9.3之前版本和18.10.1之前版本存在跨站脚本漏洞，该漏洞源于Mermaid图表中实体编码内容清理不当，可能导致经过身份验证的用户在用户浏览器中执行任意JavaScript。

CVSS 5.4 · Medium EPSS 0.29% · P20
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I. Basic Information for CVE-2026-2973

Vulnerability Information
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Vulnerability Title
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
Source: CVE Program / CVE List V5
Vulnerability Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 17.7 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an authenticated user to execute arbitrary JavaScript in a user's browser due to improper sanitization of entity-encoded content in Mermaid diagrams.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
GitLab 跨站脚本漏洞
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 18.8.7之前版本、18.9.3之前版本和18.10.1之前版本存在跨站脚本漏洞，该漏洞源于Mermaid图表中实体编码内容清理不当，可能导致经过身份验证的用户在用户浏览器中执行任意JavaScript。
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 17.7 ~ 18.8.7 cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-2973

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III. Intelligence Information for CVE-2026-2973

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Patches & Fixes for CVE-2026-2973 (1)

Same Patch Batch · GitLab · 2026-03-25 · 11 CVEs total

CVE-2026-3857 8.1 HIGH Cross-Site Request Forgery (CSRF) in GitLab
CVE-2026-2995 7.7 HIGH Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in GitLab
CVE-2026-3988 7.5 HIGH Inefficient Algorithmic Complexity in GitLab
CVE-2026-2745 6.8 MEDIUM Authentication Bypass Using an Alternate Path or Channel in GitLab
CVE-2026-1724 6.8 MEDIUM Missing Authentication for Critical Function in GitLab
CVE-2025-13436 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in GitLab
CVE-2025-13078 6.5 MEDIUM Improper Validation of Specified Quantity in Input in GitLab
CVE-2026-2726 4.3 MEDIUM Incorrect Authorization in GitLab
CVE-2025-14595 4.3 MEDIUM Missing Authorization in GitLab
CVE-2026-4363 3.7 LOW Incorrect Authorization in GitLab

IV. Related Vulnerabilities

Same product: GitLab
Same vendor: GitLab
Same weakness: CWE-79

V. Comments for CVE-2026-2973

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