CVE-2026-49956 Hermes WebUI < 0.51.269 Profile Isolation Bypass via sessions search
Authenticated users can bypass profile isolation to read session titles and transcripts from other profiles in Hermes WebUI.
- 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-2026-49956?
CVE-2026-49956 is a high-severity missing authorization vulnerability in nesquena hermes-webui, published on 9 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Hermes WebUI before version 0.51.269 contains a profile isolation bypass vulnerability that allows authenticated users to access data belonging to other profiles by querying the session search endpoint without active-profile filtering. Attackers can send requests to the sessions search handler to retrieve session titles and transcript message content from profiles other than their own active profile.
Weakness: CWE-862
Which versions are affected by CVE-2026-49956?
How do I fix CVE-2026-49956?
No fix has been published for CVE-2026-49956 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-2026-49956 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-49956 exists.
Sources
Also known as GHSA-mgxw-v6rh-wcv6.