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CVE-2026-52847: MantisBT: Reflected XSS in admin/install.php

July 15, 2026

MantisBT 2.28.3 and earlier contains six reflected XSS injection points in /admin/install.php. User-supplied parameters are echoed into HTML without escaping via print_test_result(). No authentication is required.

A Content Security Policy (script-src ‘self’) prevents inline JavaScript execution, but the CSP is missing a form-action directive, allowing exploitation via credential-phishing form injection and open redirects.

References

  • github.com/advisories/GHSA-77x8-3v3h-hrhv
  • github.com/mantisbt/mantisbt/commit/0f32ceabadc745239754962df91a51d5d51e3fd7
  • github.com/mantisbt/mantisbt/commit/f2191a0d8ce438bf74171d496cf721dae025a5c0
  • github.com/mantisbt/mantisbt/security/advisories/GHSA-77x8-3v3h-hrhv
  • mantisbt.org/bugs/view.php?id=37103
  • nvd.nist.gov/vuln/detail/CVE-2026-52847

Code Behaviors & Features

Detect and mitigate CVE-2026-52847 with GitLab Dependency Scanning

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Affected versions

All versions before 2.28.4

Fixed versions

  • 2.28.4

Solution

Upgrade to version 2.28.4 or above.

Impact 9.4 CRITICAL

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

Learn more about CVSS

Weakness

  • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Source file

packagist/mantisbt/mantisbt/CVE-2026-52847.yml

Spotted a mistake? Edit the file on GitLab.

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