CVE-2026-27838 wger: IDOR via user-unscoped cache keys on routine API actions exposes workout data
Attackers can read other users' workout data by exploiting unscoped cache keys in the wger fitness manager API.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-27838?
CVE-2026-27838 is a low-severity vulnerability in wger-project wger, published on 26 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
wger is a free, open-source workout and fitness manager. Five routine detail action endpoints check a cache before calling `self.get_object()`. In versions up to and including 2.4, ache keys are scoped only by `pk` — no user ID is included. When a victim has previously accessed their routine via the API, an attacker can retrieve the cached response for the same PK without any ownership check. Commit e964328784e2ee2830a1991d69fadbce86ac9fbf contains a patch for the issue.
Weakness: CWE-639
Which versions are affected by CVE-2026-27838?
3 open source packages ship an affected version, including wger. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
wger PyPI | All versions to 2.1 | None |
wger PyPI | All versions to 2.1 | None |
wger PyPI | All versions to 2.1 | None |
Products include Wger Wger.
How do I fix CVE-2026-27838?
No fix has been published for CVE-2026-27838 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-27838 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27838 exists.
Other vulnerabilities in wger-project wger
- CVE-2022-2650 Improper Restriction of Excessive Authentication Attempts in wger-project/wger
- CVE-2026-40474 wger has Broken Access Control in the Global Gym Configuration Update Endpoint
- CVE-2026-40353 wger: Stored XSS via Unescaped License Attribution Fields
- CVE-2026-27835 wger: IDOR in RepetitionsConfig and MaxRepetitionsConfig API leak other users' workout data
- CVE-2026-27839 wger: IDOR in nutritional_values endpoints exposes private dietary data via direct ORM lookup
Sources
Also known as GHSA-42cr-w2gr-m54q, PYSEC-2026-3418.