MantisBT 2.28.0 XSS via Tag Delete Message Escaping (CVE-2026-33517)
CVE-2026-33517 Published on March 23, 2026
MantisBT Vulnerable to Stored HTML Injection in Tag Delete Confirmation
Mantis Bug Tracker (MantisBT) is an open source issue tracker. In version 2.28.0, when deleting a Tag (tag_delete.php), improper escaping of its name when displaying the confirmation message allows an attacker to inject HTML and, if CSP settings permit, achieve execution of arbitrary JavaScript. Version 2.28.1 fixes the issue. Workarounds include reverting commit d6890320752ecf37bd74d11fe14fe7dc12335be9 and/or manually editing language files to remove the sprintf placeholder `%1$s` from `$s_tag_delete_message` string.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2026-33517 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2026-33517
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Affected Versions
mantisbt Version = 2.28.0 is affected by CVE-2026-33517Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.