CVE-2026-27839 wger: IDOR in nutritional_values endpoints exposes private dietary data via direct ORM lookup
Authenticated users can access other users' private nutrition data by manipulating object IDs in API requests.
- 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-2026-27839?
CVE-2026-27839 is a medium-severity missing authorization 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. In versions up to and including 2.4, three `nutritional_values` action endpoints fetch objects via `Model.objects.get(pk=pk)` — a raw ORM call that bypasses the user-scoped queryset. Any authenticated user can read another user's private nutrition plan data, including caloric intake and full macro breakdown, by supplying an arbitrary PK. Commit 29876a1954fe959e4b58ef070170e81703dab60e contains a fix for the issue.
Weakness: CWE-639
Which versions are affected by CVE-2026-27839?
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-2026-27839?
No fix has been published for CVE-2026-27839 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-27839 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27839 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-2026-27838 wger: IDOR via user-unscoped cache keys on routine API actions exposes workout data
Sources
Also known as GHSA-g8gc-6c4h-jg86, PYSEC-2026-3422.