Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and prior permit a user to list and download their own attachments from an Issue created by another user even after it becomes private, bypassing read access revocation. The loss of confidentiality caused by this vulnerability is minimal, considering that only attachments previously uploaded by the user themselves remain accessible. This issue has been fixed in version 2.82.2.

The version of MantisBT installed on the remote host is prior to 2.28.2. It is, therefore, affected by multiple vulnerabilities:

  - MantisBT is vulnerable to Privilege Escalation from Manager to Administrator. (CVE-2026-34390)

  - MantisBT is vulnerable to Authorization Bypass in Bugnote Editing via Issue Update API. (CVE-2026-42070)

  - MantisBT is vulnerable to Stored XSS in Custom Field Textarea Values. (CVE-2026-39960)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and prior permit a user to
    list and download their own attachments from an Issue created by another user even after it becomes
    private, bypassing read access revocation. The loss of confidentiality caused by this vulnerability is
    minimal, considering that only attachments previously uploaded by the user themselves remain accessible.
    This issue has been fixed in version 2.82.2. (CVE-2026-34744)

ID	Name	Product	Family	Severity
315202	MantisBT < 2.28.2 Multiple Vulnerabilities	Nessus	CGI abuses : XSS	high
441747	SCA: security update for mantisbt/mantisbt (GHSA-rmp5-5jj7-gmvf)	Tenable Cloud Security	SCA Checks	medium
441747	SCA: security update for mantisbt/mantisbt (GHSA-rmp5-5jj7-gmvf)	Tenable Self-Hosted Container Security	SCA Checks	medium

Detections

Analytics

CVE-2026-34744

medium

Tenable Plugins

high

medium

medium