Vulnerability · Published Feb 26, 2026 · Assigned by GitHub_M

CVE-2026-27838wger: IDOR via user-unscoped cache keys on routine API actions exposes workout data

Low 3.1

In plain English

A low-severity authorization bypass via user-controlled key 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 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 3.1)3.1Low

Exploit odds (30 days)0.3%top 77.8% 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. 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	wger	no fix listed	GHSA-42cr-w2gr-m54q
PyPI	wger	no fix listed	PYSEC-2026-3418

Affected products (as reported)

Vendor	Product	Versions
wger-project	wger	<= 2.4

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

References

https://github.com/wger-project/wger/security/advisories/GHSA-42cr-w2gr-m54q x_refsource_CONFIRM
https://github.com/wger-project/wger/commit/e964328784e2ee2830a1991d69fadbce86ac9fbf x_refsource_MISC