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CVE-2026-34390— MantisBT: Privilege Escalation from Manager to Administrator

Quick assessment

Affected
mantisbt mantisbt
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mantis Bug Tracker（MantisBT）是Mantis Bug Tracker开源的一个 bug 跟踪器。 Mantis Bug Tracker 2.28.1及之前版本存在访问控制错误漏洞，该漏洞源于ProjectUsersAddCommand中访问控制检查不足，允许具有manage_project_threshold访问级别的用户向任何用户授予项目级管理员访问权限，可能导致权限提升。

AI Predicted 6.5 Difficulty: Easy EPSS 0.47% · P39

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
mantisbt mantisbt < 2.28.2 affected
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I. Basic Information for CVE-2026-34390

Vulnerability Information
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Vulnerability Title
MantisBT: Privilege Escalation from Manager to Administrator
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Mantis Bug Tracker 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mantis Bug Tracker（MantisBT）是Mantis Bug Tracker开源的一个 bug 跟踪器。 Mantis Bug Tracker 2.28.1及之前版本存在访问控制错误漏洞，该漏洞源于ProjectUsersAddCommand中访问控制检查不足，允许具有manage_project_threshold访问级别的用户向任何用户授予项目级管理员访问权限，可能导致权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mantisbt mantisbt < 2.28.2 -

II. Public POCs for CVE-2026-34390

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III. Intelligence Information for CVE-2026-34390

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Patches & Fixes for CVE-2026-34390 (1)

Vendor Advisories for CVE-2026-34390 (2)

News Coverage for CVE-2026-34390 (1)

Same Patch Batch · mantisbt · 2026-05-19 · 7 CVEs total

CVE-2026-34754 4.3 MEDIUM MantisBT allows unauthorized users to upload attachments to restricted issues via REST API
CVE-2026-33052 MantisBT: Authorization Bypass in Global Profile Creation
CVE-2026-34744 MantisBT authorization bypass allows continued access to self-uploaded attachments on priv
CVE-2026-34463 MantisBT has Stored HTML Injection/XSS via Clone Issue Form
CVE-2026-34579 MantisBT has an authorization bypass via private issue monitoring
CVE-2026-34970 MantisBT Bugnote Revision Page Leaks Private Issue Metadata After Issue Access Is Revoked

IV. Related Vulnerabilities

Same product: mantisbt
Same vendor: mantisbt
Same weakness: CWE-284

V. Comments for CVE-2026-34390

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