CVE-2026-34390
MantisBT: Privilege Escalation from Manager to Administrator
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.
INFO
Published Date :
May 19, 2026, 10:16 p.m.
Last Modified :
July 24, 2026, 9:10 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update MantisBT to version 2.28.2.
- Verify access control checks for project users.
- Review project administrator privileges.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34390.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34390 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34390
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34390 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34390 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Jul. 24, 2026
Action Type Old Value New Value Added Translation Title: Mantis Bug Tracker (MantisBT), Description: Mantis Bug Tracker (MantisBT) es un rastreador de problemas de código abierto. Las versiones 2.28.1 y anteriores tienen una vulnerabilidad de escalada de privilegios donde los controles de control de acceso insuficientes en ProjectUsersAddCommand (manage_proj_user_add.PHP) permiten a los usuarios con nivel de acceso manage_project_threshold (gestor por defecto) otorgar acceso de administrador a nivel de proyecto a cualquier usuario (incluyéndose a sí mismos) en cualquier Proyecto en el que tengan derechos de gestor. El formulario normal de adición de usuario de proyecto restringe los niveles de acceso seleccionables al rol de proyecto propio del actor o inferior. Sin embargo, el gestor de backend aún acepta un valor de access_level falsificado superior y lo escribe. Las consecuencias de la escalada de privilegios son leves, ya que tener acceso de administrador a nivel de Proyecto no es muy diferente de ser gestor, y en realidad no otorga privilegios de administrador en toda la instancia de MantisBT. En particular, no permite al usuario mejorado eliminar el Proyecto ni les otorga acceso a funciones administrativas globales como gestionar Usuarios, Proyectos, Plugins, Campos Personalizados, etc. Este problema ha sido solucionado en la versión 2.28.2. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'mantisbt', 'product': 'mantisbt', 'versions': [{'status': 'affected', 'version': '< 2.28.2'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-34390', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-05-20T13:05:44.018367Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 20, 2026
Action Type Old Value New Value Added Reference https://mantisbt.org/bugs/view.php?id=36995 Added Reference https://mantisbt.org/bugs/view.php?id=37002 -
New CVE Received by [email protected]
May. 19, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-284 Added Reference https://github.com/mantisbt/mantisbt/commit/69e0180f180ed5acf48a8d281a73683a7bf32461 Added Reference https://github.com/mantisbt/mantisbt/security/advisories/GHSA-frf7-jhp9-jxm6 Added Reference https://mantisbt.org/bugs/view.php?id=36995 Added Reference https://mantisbt.org/bugs/view.php?id=37002