CVE-2026-42071
EPSS 0.05%MantisBT has a Private Bugnote Attachment Content Leak via REST API
Description
A missing authorization check in MantisBT's file visibility function allows any authenticated user (REPORTER+) to download attachments on private bugnotes they should not be able to access, via the REST API endpoint GET /api/rest/issues/{id}/files and SOAP API mc_issue_attachment_get endpoint. ### Impact - REPORTER (access level 25) can view file attachments that were uploaded to private bugnotes by DEVELOPER/MANAGER/ADMIN users - Private bugnotes are intended for internal developer discussion; their attachments (logs, screenshots, patches) should be equally protected - The web UI is NOT affected — it filters through bugnote_get_all_visible_bugnotes() first ### Patches - 029d9d203d9e4ae96b3e59d552fa7395cc1e5071 ### 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 - Tang Cheuk Hei (@siunam321) This advisory's contents was largely copied from Tristan's well-written report.
Affected packages (1)
- Packagist/mantisbt/mantisbt>= 2.23.0, < 2.28.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N |
References (7)
- ADVISORYhttps://github.com/advisories/GHSA-xjmx-cprh-646r
- PATCHhttps://github.com/mantisbt/mantisbt
- WEBhttps://github.com/mantisbt/mantisbt/commit/029d9d203d9e4ae96b3e59d552fa7395cc1e5071
- WEBhttps://github.com/mantisbt/mantisbt/security/advisories/GHSA-pw5x-2mf9-3xc8
- WEBhttps://mantisbt.org/bugs/view.php?id=27039
- WEBhttps://mantisbt.org/bugs/view.php?id=36985
- WEBhttps://mantisbt.org/bugs/view.php?id=37092