Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-pw5x-2mf9-3xc8
Advisory ID github_osv/GHSA-pw5x-2mf9-3xc8
Aliases CVE-2026-42071
Summary MantisBT has a Private Bugnote Attachment Content Leak via REST API 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.
Status Published
Exploitability 0.5
Weighted Severity 6.5
Risk 3.2
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-862 Missing Authorization
System Score Found at
cvssv4 7.2 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-pw5x-2mf9-3xc8/GHSA-pw5x-2mf9-3xc8.json
generic_textual HIGH
Reference id Reference type URL
https://github.com/mantisbt/mantisbt
https://github.com/mantisbt/mantisbt/commit/029d9d203d9e4ae96b3e59d552fa7395cc1e5071
https://github.com/mantisbt/mantisbt/security/advisories/GHSA-pw5x-2mf9-3xc8
https://mantisbt.org/bugs/view.php?id=27039
https://mantisbt.org/bugs/view.php?id=36985
https://mantisbt.org/bugs/view.php?id=37092
CVE-2026-42071 https://nvd.nist.gov/vuln/detail/CVE-2026-42071
GHSA-xjmx-cprh-646r https://github.com/advisories/GHSA-xjmx-cprh-646r
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: 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 Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-pw5x-2mf9-3xc8/GHSA-pw5x-2mf9-3xc8.json
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

There are no SSVC decisions available.