Vulnerability · Published Oct 7, 2026 · Assigned by GitHub_M

CVE-2026-43976wger: cross-tenant admin notes/contracts leak via gym=None bypass (5 views)

High 7.1

In plain English

A high-severity incorrect authorization in wger from wger-project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).

Severity (CVSS 3.1)7.1High

Exploit odds (30 days)0.2%top 87.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

wger is a free, open-source workout and fitness manager. Prior to version 2.6, five gym management views in wger apply a flawed gym-scope guard (`gym_a != gym_b`) that silently passes when both operands are `None`. A trainer with `gym.gym_trainer` and `gym.add_adminusernote` permissions and no gym assignment (`gym=None`) can read private admin notes, uploaded documents, gym contracts, user configuration, and user permission data for **any other unaffiliated user** on the instance. The subsequent querysets filter only on the attacker-supplied `member_id` with no secondary gym-scoped validation, so all records are disclosed. Version 2.6 fixes the issue.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	wger	no fix listed	GHSA-c72h-82w6-rqfp
PyPI	wger	no fix listed	PYSEC-2026-4313

Affected products (as reported)

Vendor	Product	Versions
wger-project	wger	< 2.6

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

References

https://github.com/wger-project/wger/security/advisories/GHSA-c72h-82w6-rqfp x_refsource_CONFIRM
https://github.com/wger-project/wger/releases/tag/2.6 x_refsource_MISC