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Not in CISA KEV
MEDIUM severity

GHSA-h4x5-gvx6-3rwc

MEDIUMFix: mantisbt/mantisbt@b262b4d

GHSA-h4x5-gvx6-3rwc is a medium-severity (CVSS 4.3) vulnerability in mantisbt/mantisbt. O3 Security confirms whether GHSA-h4x5-gvx6-3rwc is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

MantisBT has an Authorization Bypass that Allows Uploading Attachments to Private Issues via REST API

Also known asCVE-2026-34754
Published
May 11, 2026
Updated
Jun 5, 2026
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Jun 5, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
🐘mantisbt/mantisbt

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Impact

MantisBT allows an authenticated user to upload attachments to private Issues they are not authorized to access.

Patches

  • b262b4d2835b81394d75356dead66e52a6275206

Workarounds

None.

Credits

Thanks to Vishal Shukla for discovering and responsibly reporting the issue.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistmantisbt/mantisbtall versions2.28.2

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for mantisbt/mantisbt. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update mantisbt/mantisbt to 2.28.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-h4x5-gvx6-3rwc is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether GHSA-h4x5-gvx6-3rwc is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-h4x5-gvx6-3rwc. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### Impact MantisBT allows an authenticated user to upload attachments to private Issues they are not authorized to access. ### Patches - b262b4d2835b81394d75356dead66e52a6275206 ### Workarounds None. ### Credits Thanks to Vishal Shukla for discovering and responsibly reporting the issue.
O3 Security · Impact-Aware SCA

Is GHSA-h4x5-gvx6-3rwc in your dependencies?

O3 detects GHSA-h4x5-gvx6-3rwc across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

GHSA-h4x5-gvx6-3rwc: mantisbt/mantisbt… | O3 Security