CVE-2026-50198 Wallos: Cross-user subscription cost inference via replacement_subscription_id
Authenticated users can infer other users' subscription costs by manipulating replacement IDs, exposing derived financial metadata.
- 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-2026-50198?
CVE-2026-50198 is a medium-severity vulnerability in ellite Wallos, published on 31 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.9.1, an authenticated user can edit their own inactive subscription and set replacement_subscription_id to a subscription ID belonging to another user. The write is accepted, and later the stats logic dereferences that foreign subscription ID without user_id scoping. This lets the attacker infer the victim subscription's monthly-normalized cost by observing changes in their own stats output. This does not expose the full victim subscription object, but it does expose derived financial metadata. This issue has been patched in version 4.9.1.
Weakness: CWE-639
Which versions are affected by CVE-2026-50198?
How do I fix CVE-2026-50198?
No fix has been published for CVE-2026-50198 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-50198 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-50198 exists.
Sources
Also known as GHSA-hggr-v8rm-c6jj.