Auth bypass in Wger
CVE-2026-40474
wger is a free, open-source workout and fitness manager. In versions 2.5 and below, the GymConfigUpdateView declares permission_required = 'config.change_gymconfig' but inherits WgerFormMixin instead of WgerPermissionMixin, so the permission is never enforced at runtime. Since GymConfig is an ownerless singleton, any authenticated user can modify the global gym configuration, triggering save() side effects that bulk-update user profile gym assignments — a vertical privilege escalation to installation-wide configuration control. This issue is fixed in version 2.5.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L.
EPSS exploit prediction
EPSS: 0.004 (32.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Wger
- Wger-Project Wger — versions < 2.5
Weakness classification (CWE)
References
- github.com/wger-project/wger/security/advisories/GHSA-xppv-4jrx-qf8m (Exploit, Vendor Advisory)
- github.com/wger-project/wger/commit/47ee5af93b3ced24b9f94b0a8b9296b50bc9523f (Patch)
- github.com/wger-project/wger/releases/tag/2.5 (Release Notes)
Frequently asked questions
- What is CVE-2026-40474?
- CVE-2026-40474 is a high-severity vulnerability in Wger, classified under Improper Access Control. CVSS score: 7.6/10. Published 2026-04-17.
- How severe is CVE-2026-40474?
- High severity. CVSS v3 base score is 7.6 out of 10.