GHSA-pq86-j2c2-47f6 MantisBT: Authorization Bypass in Bugnote Editing via Issue Update API

• Packagist mantisbt/mantisbt: < 2.28.2 → fixed in 2.28.2

The mc_issue_update() function in MantisBT allows users having *update_bug_threshold* access (UPDATER, with default settings) to edit, change view state, and modify time tracking on bugnotes belonging to other users — bypassing the default DEVELOPER (level 55) threshold required by the dedicated mc_issue_note_update() function. Impact 1. UPDATER can edit notes by DEVELOPER/MANAGER/ADMIN — bypassing the DEVELOPER threshold 2. UPDATER can change private notes to public — exposing confidential internal discussion 3. UPDATER can change public notes to private — hiding information from reporters/viewers Patches • 6e58fae4f22efdc3987f903c8ba2611de17a9435 Workarounds None Credits Thanks to the following security researchers for independently discovering and responsibly reporting the issue. • Vishal Shukla • Tristan Madani (@TristanInSec) from Talence Security This advisory's contents was largely copied from Tristan's well-written report.