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CVE-2026-33517: MantisBT Vulnerable to Stored HTML Injection in Tag Delete Confirmation

March 25, 2026

Improper escaping of Tag name when deleting it in tag_delete.php allows an attacker to inject HTML and, if CSP settings permit, achieve execution of arbitrary JavaScript.

References

  • github.com/advisories/GHSA-fh48-f69w-7vmp
  • github.com/mantisbt/mantisbt
  • github.com/mantisbt/mantisbt/commit/80990f43153167c73f11eb4b2bc7108d0c3d6b46
  • github.com/mantisbt/mantisbt/commit/d6890320752ecf37bd74d11fe14fe7dc12335be9
  • github.com/mantisbt/mantisbt/security/advisories/GHSA-fh48-f69w-7vmp
  • mantisbt.org/bugs/view.php?id=36971
  • nvd.nist.gov/vuln/detail/CVE-2026-33517

Code Behaviors & Features

Detect and mitigate CVE-2026-33517 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →

Affected versions

All versions starting from 2.28.0 before 2.28.1, version 2.28.0

Fixed versions

  • 2.28.1

Solution

Upgrade to version 2.28.1 or above.

Impact 6.1 MEDIUM

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

Learn more about CVSS

Weakness

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

Source file

packagist/mantisbt/mantisbt/CVE-2026-33517.yml

Spotted a mistake? Edit the file on GitLab.

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