Improper Encoding or Escaping of Output in GitLab_CVE-2025-8405

8.7 / 10

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Description

GitLab has remediated a security issue in GitLab CE/EE affecting all versions from 17.1 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to perform unauthorized actions on behalf of other users by injecting malicious HTML into vulnerability code flow displays.

AI Analysis

Improper encoding or escaping of output in GitLab allows authenticated users to inject malicious HTML and perform unauthorized actions.

Basic Information

ID CVE-2025-8405

Source GitLab

Published Dec 11, 2025 at 04:05

Affected Product

Vendor GitLab

Product GitLab

Version 17.1

Affected Versions GitLab GitLab 17.1
GitLab GitLab 18.5
GitLab GitLab 18.6

CWE Classification

CWE-116

AI Assessment

AI Score 8.7 / 10

AI Severity High

Vendor GitLab

Product GitLab CE/EE

Version 17.1, 18.5, 18.6

References

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    "published": "2025-12-11T04:05:07.234Z",
    "modified": "2025-12-11T04:05:07.234Z",
    "type": "cve",
    "title": "Improper Encoding or Escaping of Output in GitLab",
    "source": "GitLab",
    "references": "https://gitlab.com/gitlab-org/gitlab/-/issues/558214\nhttps://hackerone.com/reports/3270940\nhttps://about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released/",
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    "sourceData": "GitLab GitLab 17.1\nGitLab GitLab 18.5\nGitLab GitLab 18.6",
    "sourceHref": "",
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        "cvssV3": {
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    "ai_description": "Improper encoding or escaping of output in GitLab allows authenticated users to inject malicious HTML and perform unauthorized actions.",
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