Summaryinfo

A vulnerability, which was classified as problematic, has been found in mantisbt Mantis Bug Tracker 2.28.0. Impacted is the function tag_delete of the file tag_delete.php of the component Confirmation Message Handler. The manipulation of the argument s_tag_delete_message leads to cross site scripting. This vulnerability is uniquely identified as CVE-2026-33517. The attack is possible to be carried out remotely. No exploit exists. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in mantisbt Mantis Bug Tracker 2.28.0. This issue affects the function tag_delete of the file tag_delete.php of the component Confirmation Message Handler. The manipulation of the argument s_tag_delete_message with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product 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. Impacted is integrity. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-33517 since 03/20/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

By approaching the search of inurl:tag_delete.php it is possible to find vulnerable targets with Google Hacking. The vulnerability scanner Nessus provides a plugin with the ID 303448 (MantisBT 2.28.0 Tag Deletion XSS (GHSA-fh48-f69w-7vmp)), which helps to determine the existence of the flaw in a target environment.

Applying the patch 80990f43153167c73f11eb4b2bc7108d0c3d6b46 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (303448). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Bug Tracking Software

Vendor

• mantisbt

Name

• Mantis Bug Tracker

Version

• 2.28.0

License

• open-source

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CPE 2.2info

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