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EUVD-2026-321538

fkie_cve-2026-40607

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In versions 2.11.0 through 2.28.1, a Stored XSS vulnerability is caused by incorrect escaping of a saved filter's owner, allowing an attacker to inject arbitrary HTML on systems where $g_show_user_realname = ON. Note that By default, only users with Manager access level or above can save their filters publicly. This issue has been fixed in version 2.28.2. If developers are unable to update immediately, they can work around this issue by preventing display of users' real names (set $g_ show_user_realname = OFF; in configuration), and restricting the ability to store filters (set $g_stored_query_create_threshold / $g_stored_query_create_shared_threshold to NOBODY).

GHSA-f633-865q-2mhh — MantisBT is Vulnerable to Stored XSS in Saved-Filter Owner Column

Affected: Packagist: mantisbt/mantisbt

Incorrect escaping of a saved filter's owner allows an attacker to inject arbitrary HTML on systems where $g_show_user_realname = ON.

### Impact Cross-site scripting (XSS).

Note that By default, only users with *Manager* access level or above can save their filters publicly

### Patches - 44f490bcf20fd491c1b8f3fc9dd041d8c2a30010

### Workarounds - Prevent display of users' real name (set `$g_ show_user_realname = OFF;` in configuration) - Restrict ability to store filters (set $`g_stored_query_create_threshold` / $`g_stored_query_create_shared_threshold` to `NOBODY`

### Credits Thanks to siunam (Tang Cheuk Hei) for discovering and responsibly reporting the issue.