🛡️ CVE-2026-42070 — mantisbt

⚪ Unknown ✅ No Known Exploit CWE-863 NVD
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

MantisBT: Authorization Bypass in Bugnote Editing via Issue Update API

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. Rated impact: confidentiality low, integrity low, availability low.

Weakness class

CVE-2026-42070 is classified as CWE-863: Incorrect Authorization. An authorisation check runs but reaches the wrong conclusion, permitting actions it should refuse.

Affected software

CVE-2026-42070 is recorded against 2 packages.

  • mantisbt/mantisbt (fixed in 2.28.2)
  • unknown

Timeline and source

Published on 11 May 2026 and last revised on 9 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)
mantisbt.org (Web)
mantisbt.org (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
CWE CWE-863
Public Exploit ✅ No
Source NVD
Published 2026-05-11
Updated 2026-08-12
Modified 2026-06-09
Fix URL N/A

Affected Packages

Software From version Fixed in
mantisbt/mantisbt — 2.28.2
unknown — —

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