CVE-2026-40597

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In versions 2.28.1 and below, given any pre-existing XSS / HTML injection vulnerability, an attacker can bypass the Content Security Policy's script-src directive by uploading a crafted attachment to any issue that, when accessed via the file_download.php link, will be downloaded with a valid JavaScript MIME type resulting in script execution. The uploaded payload must be sniffed as a valid JavaScript MIME type by PHP finfo (see file_create_finfo() API function). Non-JavaScript MIME types will not get imported in a <script> tag by the browser, due to response header X-Content-Type-Options being set to nosniff, which requires all imported JavaScript files to be a valid JavaScript MIME type. This issue has been fixed in version 2.28.2.

• CWE-79
• CWE-358

• https://github.com/mantisbt/mantisbt/commit/9e3bee2e7b909f4e3596985892b8bc8bee9e0bfe
• https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3
• https://mantisbt.org/bugs/view.php?id=37016

Published

May 22, 2026

Last Modified

Jul 23, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-40591FreeScout is a free self-hosted help desk and shared mailbox…7.1
• CVE-2026-40592FreeScout is a free self-hosted help desk and shared mailbox…5.9
• CVE-2026-40593ChurchCRM is an open-source church management system. In ver…4.8
• CVE-2026-40594pyLoad is a free and open-source download manager written in…4.8
• CVE-2026-40595Chartbrew is an open-source web application that can connect…7.5
• CVE-2026-40596Mantis Bug Tracker (MantisBT) is an open source issue tracke…7.2
• CVE-2026-40598Mantis Bug Tracker (MantisBT) is an open source issue tracke…6.9
• CVE-2026-40599ClearanceKit intercepts file-system access events on macOS a…7.1
• CVE-2026-4060The Geo Mashup plugin for WordPress is vulnerable to Time-Ba…7.5
• CVE-2026-40600Chartbrew is an open-source web application that can connect…8.1
• CVE-2026-40601Chartbrew is an open-source web application that can connect…7.5
• CVE-2026-40602The Home Assistant Command-line interface (hass-cli) is a co…5.6