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CVE-2026-5262— 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 18.9.6之前版本、18.10.4之前版本和18.11.1之前版本存在跨站脚本漏洞，该漏洞源于输入验证不当，可能导致未经身份验证的用户访问Storybook开发环境中的令牌。

CVSS 8.0 · High EPSS 0.36% · P27
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I. Basic Information for CVE-2026-5262

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 16.1.0 before 18.9.6, 18.10 before 18.10.4, and 18.11 before 18.11.1 that under certain conditions could have allowed an unauthenticated user to access tokens in the Storybook development environment due to improper input validation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/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 18.9.6之前版本、18.10.4之前版本和18.11.1之前版本存在跨站脚本漏洞，该漏洞源于输入验证不当，可能导致未经身份验证的用户访问Storybook开发环境中的令牌。
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 16.1.0 ~ 18.9.6 cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-5262

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III. Intelligence Information for CVE-2026-5262

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Patches & Fixes for CVE-2026-5262 (1)

Same Patch Batch · GitLab · 2026-04-22 · 11 CVEs total

CVE-2026-4922 8.1 HIGH Cross-Site Request Forgery (CSRF) in GitLab
CVE-2026-5816 8.0 HIGH Improper Resolution of Path Equivalence in GitLab
CVE-2025-0186 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in GitLab
CVE-2025-3922 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in GitLab
CVE-2025-6016 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in GitLab
CVE-2026-1660 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in GitLab
CVE-2026-6515 5.4 MEDIUM Insufficient Session Expiration in GitLab
CVE-2026-5377 4.3 MEDIUM Incorrect Authorization in GitLab
CVE-2026-3254 3.5 LOW Improper Restriction of Rendered UI Layers or Frames in GitLab
CVE-2025-9957 2.7 LOW Incorrect Authorization in GitLab

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-5262

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