Vulnerability · Published Oct 7, 2026 · Assigned by GitHub_M

CVE-2026-46438wger: Cross-User Data Corruption via Missing Ownership Check on WorkoutLog.slot_entry

Medium 6.5

In plain English

A medium-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 0.2% (higher than 14% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.2%top 86.5% 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, an authenticated attacker can inject arbitrary workout log entries into any other user's `SlotEntry` by supplying the victim's `slot_entry` ID in a `POST /api/v2/workoutlog/` request. The `slot_entry` foreign key is not included in the ownership verification performed by `WorkoutLogViewSet.get_owner_objects()`, so the server accepts and persists the cross-user reference without error. Because `SlotEntry.get_config_data()` retrieves associated logs via `self.workoutlog_set.all()` with no user filter, the attacker's injected data is silently folded into the victim's progressive-overload calculations, corrupting their auto-generated weight and repetition targets. Version 2.6 contains a patch.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	wger	no fix listed	GHSA-rjpf-7pf5-q54x
PyPI	wger	no fix listed	PYSEC-2026-4314

Affected products (as reported)

Vendor	Product	Versions
wger-project	wger	< 2.6

Weakness: CWE-639, CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

References

https://github.com/wger-project/wger/security/advisories/GHSA-rjpf-7pf5-q54x x_refsource_CONFIRM
https://github.com/wger-project/wger/releases/tag/2.6 x_refsource_MISC