CVE-2026-43978
wger: Privilege escalation via trainer-login session chaining allows gym trainers to impersonate gym managers
Description
wger is a free, open-source workout and fitness manager. In versions prior to 2.6, a gym trainer can escalate their session to any higher-privileged account (gym manager, general manager) by chaining two calls to the trainer-login endpoint. Once a trainer performs a legitimate switch into a low-privileged user, the session flag trainer.identity is set and this flag alone bypasses the permission check on all subsequent trainer-login calls. This grants full gym administration capabilities including viewing all member data, modifying contracts, managing gym configuration, and accessing other trainers' and managers' personal information. This issue has been fixed in version 2.6.
INFO
Published Date :
July 16, 2026, 11:16 p.m.
Last Modified :
Oct. 24, 2026, 8:10 p.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 3.1 | HIGH | [email protected] |
Solution
- Update wger to version 2.6 or later.
- Apply vendor patches if available.
- Review access controls and permissions.
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-2026-43978.
| URL | Resource |
|---|---|
| https://github.com/wger-project/wger/security/advisories/GHSA-9qpr-vc49-hqg2 | |
| https://github.com/wger-project/wger/security/advisories/GHSA-9qpr-vc49-hqg2 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-43978 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-2026-43978
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-2026-43978 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-43978 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.
-
CVE Translated by [email protected]
Oct. 24, 2026
Action Type Old Value New Value Added Translation Title: wger de wger-project, Description: wger es un gestor de entrenamientos y fitness gratuito y de código abierto. En versiones anteriores a la 2.6, un entrenador de gimnasio puede escalar su sesión a cualquier cuenta con mayores privilegios (gerente de gimnasio, gerente general) encadenando dos llamadas al endpoint trainer-login. Una vez que un entrenador realiza un switch legítimo a un usuario con pocos privilegios, la bandera de sesión trainer.identity se establece y esta bandera por sí sola omite la verificación de permisos en todas las llamadas posteriores a trainer-login. Esto otorga capacidades completas de administración del gimnasio, incluyendo la visualización de todos los datos de los miembros, la modificación de contratos, la gestión de la configuración del gimnasio y el acceso a la información personal de otros entrenadores y gerentes. Este problema ha sido solucionado en la versión 2.6. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 17, 2026
Action Type Old Value New Value Added Reference https://github.com/wger-project/wger/security/advisories/GHSA-9qpr-vc49-hqg2 Added SSVC {'id': 'CVE-2026-43978', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-17T10:49:18.653519Z'} -
New CVE Received by [email protected]
Jul. 16, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'wger-project', 'product': 'wger', 'versions': [{'status': 'affected', 'version': '< 2.6'}]}] Added Description wger is a free, open-source workout and fitness manager. In versions prior to 2.6, a gym trainer can escalate their session to any higher-privileged account (gym manager, general manager) by chaining two calls to the trainer-login endpoint. Once a trainer performs a legitimate switch into a low-privileged user, the session flag trainer.identity is set and this flag alone bypasses the permission check on all subsequent trainer-login calls. This grants full gym administration capabilities including viewing all member data, modifying contracts, managing gym configuration, and accessing other trainers' and managers' personal information. This issue has been fixed in version 2.6. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Added CWE CWE-269 Added Reference https://github.com/wger-project/wger/security/advisories/GHSA-9qpr-vc49-hqg2