CVE-2026-62944: MantisBT stored XSS in print_all_bug_page_word.php

CVE-2026-62944 · Severity: high · CVSS 4 · Published 2026-07-15

MantisBT is a popular open-source bug tracking system. A security vulnerability allows an authenticated user to upload an image with a specially crafted filename that executes malicious scripts when other users view the bug report's export page. This could lead to unauthorized actions being performed in the context of the victim's session, though the impact is partially mitigated by the application's security policies.

Technologies: mantisbt/mantisbt (Packagist). Vendors: Packagist.

Quick answers

Is CVE-2026-62944 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-62944 being exploited in the wild.
How severe is CVE-2026-62944?
High severity, with a CVSS score of 4, published 15 July 2026.
Which products and versions are affected?
mantisbt/mantisbt (Packagist) <= 2.28.3, ECOSYSTEM:introduced=0,fixed=2.28.4.
Is there a fix for CVE-2026-62944?
Yes. mantisbt/mantisbt (Packagist): upgrade to 2.28.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-62944 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2026-62944?
Check whether you run mantisbt/mantisbt (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • mantisbt/mantisbt (Packagist): upgrade to 2.28.4 or later
    composer require mantisbt/mantisbt:^2.28.4

Technical details

A stored cross-site scripting (XSS) vulnerability exists in MantisBT due to missing output encoding in 'print_all_bug_page_word.php'. An authenticated attacker can upload an image attachment with a crafted filename (e.g., containing a double quote and an 'onload' event handler). When a user views the HTML export page (type_page=html&export=1), the filename is improperly rendered within an IMG tag's 'alt' attribute, allowing the attacker to break out of the attribute and execute arbitrary JavaScript. The vulnerability is mitigated by the application's Content Security Policy (CSP). The issue is fixed in version 2.28.4.

Affected products

  • MantisBT MantisBT <= 2.28.3

Identifiers

  • CVE-2026-62944
  • GHSA-h2wf-967x-gxvw

Timeline

  • 2026-07-15: disclosed
  • 2026-07-15: patched
  • 2026-07-15: advisory

References

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