# CVE-2026-34744: MantisBT authorization bypass in private issue attachments

Source: https://junglewise.ai/threats/cve-2026-34744-mantisbt-authorization-bypass-in-private-issue-attachments  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-19. Updated: 2026-06-05  
License: CC BY 4.0 with a link back

CVE-2026-34744 · Severity: medium · CVSS 4 · Published 2026-05-19

MantisBT, a popular open-source bug tracking system, contains a flaw where users can still access files they previously uploaded to a ticket even after that ticket has been made private. While this does not allow users to see other people's data, it represents a failure in expected privacy controls when an issue's visibility is restricted. This could lead to minor unauthorized data access if a user was intended to be completely locked out of a specific project or issue.

Technologies: [MantisBT Mantis Bug Tracker](https://junglewise.ai/threats/technologies/mantisbt), [mantisbt/mantisbt (Packagist)](https://junglewise.ai/threats/technologies/mantisbt-mantisbt). Vendors: [MantisBT](https://junglewise.ai/threats/vendors/mantisbt), [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is CVE-2026-34744 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-34744 being exploited in the wild.

**How severe is CVE-2026-34744?** Medium severity, with a CVSS score of 4, published 19 May 2026.

**Which products and versions are affected?** MantisBT Mantis Bug Tracker <= 2.28.1; MantisBT <= 2.28.1; mantisbt/mantisbt (Packagist) <= 2.28.1, ECOSYSTEM:introduced=0,fixed=2.28.2.

**Is there a fix for CVE-2026-34744?** Yes. mantisbt/mantisbt (Packagist): upgrade to 2.28.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-34744 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-34744?** Check whether you run MantisBT Mantis Bug Tracker, MantisBT or mantisbt/mantisbt (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- mantisbt/mantisbt (Packagist): upgrade to 2.28.2 or later

  ```sh
  composer require mantisbt/mantisbt:^2.28.2
  ```


## Technical details

An authorization bypass vulnerability exists in MantisBT (versions up to 2.28.1) due to improper access control checks on attachments. Specifically, the system fails to revoke access to attachments for the original uploader when the parent issue's visibility is changed to 'private' or when the user's permissions to the issue are otherwise removed. An authenticated attacker with network access can exploit this to list and download files they previously attached to an issue they can no longer view. The vulnerability is addressed in version 2.28.2.

## Affected products

- MantisBT MantisBT <= 2.28.1

## Identifiers

- CVE-2026-34744
- GHSA-rmp5-5jj7-gmvf

## Timeline

- 2026-05-09: disclosed: Initial disclosure by researcher
- 2026-05-11: advisory: GitHub Advisory published
- 2026-05-19: other: NVD published date

## References

- [https://api.github.com/users/shukla304](https://api.github.com/users/shukla304)
- [https://github.com/shukla304](https://github.com/shukla304)
- [https://api.github.com/users/shukla304/gists%7B/gist_id%7D](https://api.github.com/users/shukla304/gists%7B/gist_id%7D)
- [https://api.github.com/users/shukla304/repos](https://api.github.com/users/shukla304/repos)
- [https://avatars.githubusercontent.com/u/6738276?v=4](https://avatars.githubusercontent.com/u/6738276?v=4)
- [https://api.github.com/users/shukla304/events%7B/privacy%7D](https://api.github.com/users/shukla304/events%7B/privacy%7D)

## Related threats

- [MantisBT authentication bypass in SOAP API](https://junglewise.ai/threats/cve-2026-47156-mantisbt-authentication-bypass-in-soap-api)
- [MantisBT stored XSS in print_all_bug_page_word.php](https://junglewise.ai/threats/cve-2026-62944-mantisbt-stored-xss-in-print-all-bug-page-word-php)
- [MantisBT improper input validation in REST and SOAP APIs](https://junglewise.ai/threats/cve-2026-52883-mantisbt-improper-input-validation-in-rest-and-soap-apis)
- [MantisBT authorization bypass in REST and SOAP APIs](https://junglewise.ai/threats/cve-2026-52882-mantisbt-authorization-bypass-in-rest-and-soap-apis)
- [MantisBT reflected XSS in admin/install.php](https://junglewise.ai/threats/cve-2026-52881-mantisbt-reflected-xss-in-admin-install-php)