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CVE-2026-84739— 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 已修复 GitLab CE/EE 中的一个安全漏洞。该漏洞影响 13.11 至 19.2.7 之前、19.3 至 19.3.3 之前以及 19.4 至 19.4.1 之前的所有版本。在特定条件下，由于合并请求（merge request）差异查看器中对路径组件的净化处理不当，经过身份验证的用户可能能够在其他用户的浏览器会话上下文中执行任意 JavaScript 代码。

CVSS 8.7 · High

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
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I. Basic Information for CVE-2026-84739

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 13.11 before 19.2.7, 19.3 before 19.3.3, and 19.4 before 19.4.1 that under certain conditions could have allowed an authenticated user to execute arbitrary JavaScript in the context of another user's browser session due to improper sanitization of path components in the merge request diff viewer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
GitLab GitLab 13.11 ~ 19.2.7 cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-84739

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III. Intelligence Information for CVE-2026-84739

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Patches & Fixes for CVE-2026-84739 (1)

Other References for CVE-2026-84739 (1)

Same Patch Batch · GitLab · 2026-09-29 · 4 CVEs total

CVE-2026-8937 4.3 MEDIUM Missing Authorization in GitLab
CVE-2026-10518 4.3 MEDIUM Incorrect Authorization in GitLab
CVE-2026-4523 3.7 LOW Missing Authorization in GitLab

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-84739

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