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TI-2026-26676 Aliases CVE-2026-34390GHSA-frf7-jhp9-jxm6

MantisBT: Privilege Escalation from Manager to Administrator

Priority MEDIUM 62CWE-284Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-284.

Summary

Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and prior have a Privilege Escalation vulnerability where insufficient access control checks in ProjectUsersAddCommand (manage_proj_user_add.php) allow users having manage_project_threshold access level (manager by default) to grant project-level administrator access to any user (including themselves) in any Project they have manager rights in. The normal project-user add form restricts the selectable access levels to the actor's own project role or below. However, the backend handler still accepts a forged higher access_level value and writes it. The consequences of the privilege escalation are slight, as having administrator access at Project level is effectively not very different from being manager, and it does not actually give administrator privileges on the whole MantisBT instance. In particular, it does not let the upgraded user delete the Project or grant them any access to global administrative functions such as managing Users, Projects, Plugins, Custom Fields, etc. This issue has been fixed in version 2.28.2.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00427 37th percentileScored 2026-11-07
Fix Fixed mantisbt (mantisbt): 2.28.2mantisbt/mantisbt (Packagist): 2.28.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
mantisbtmantisbtbefore 2.28.22.28.2Patch availableCNA
—mantisbt/mantisbt (Packagist)before 2.28.22.28.2Patch availableGHSA-frf7-jhp9-jxm6
  • mantisbt Vendormantisbt Affected before 2.28.2 Fixed in 2.28.2 Patch available CNA
  • mantisbt/mantisbt (Packagist) Vendor— Affected before 2.28.2 Fixed in 2.28.2 Patch available GHSA-frf7-jhp9-jxm6

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:mantisbt:mantisbt:*:*:*:*:*:*:*:*——mantisbt
  • cpe:2.3:a:mantisbt:mantisbt:*:*:*:*:*:*:*:* Versions — — ·mantisbt

Remediation

  • Fix · CNA mantisbt (mantisbt) Fixed in 2.28.2
  • Fix · GHSA-frf7-jhp9-jxm6 mantisbt/mantisbt (Packagist) Fixed in 2.28.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34390
  2. 2026-10-03 Alias added: GHSA-frf7-jhp9-jxm6

References

Advisory 1

Other 5

  • TI-2017-05251 MantisBT through 2.3.0 allows arbitrary password reset and unauthenticated admin access… CVSS 3.1HIGH 8.8
  • TI-2026-29334 MantisBT has Potential Referer-Based Reflected HTML Injection / XSS in Tag Update Page CVSS 4.0MEDIUM 6.9
  • TI-2014-05966 The XmlImportExport plugin in MantisBT 1.2.17 and earlier allows remote attackers to… CVSS 2.0HIGH 7.5
  • TI-2026-27192 MantisBT Bugnote Revision Page Leaks Private Issue Metadata After Issue Access Is Revoked CVSS 4.0MEDIUM 5.3
  • TI-2026-25495 MantisBT: Authorization Bypass in Global Profile Creation CVSS 4.0MEDIUM 5.3
  • TI-2025-38760 MantisBT unauthorized disclosure of private project column configuration CVSS 4.0MEDIUM 5.3
See all 144 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences