CVE-2026-43978

wger: Privilege escalation via trainer-login session chaining allows gym trainers to impersonate gym managers

State: Published
Severity: 8.1 High
Published: Jul 16, 2026
Updated: Jul 17, 2026
Reserved: May 4, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-269 Improper Privilege Management

Affected Products

Product	Versions
wgerwger-project	< 2.6Affected

References

https://github.com/wger-project/wger/security/advisories/GHSA-9qpr-vc49-hqg2

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