CVE-2026-58174 Hermes WebUI < 0.51.521 - Cross-Profile Authorization Bypass via Unset Session Profile on Import
Attackers can bypass profile isolation to read files from other users' workspaces by exploiting a null profile assignment during session import.
- 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-2026-58174?
CVE-2026-58174 is a medium-severity missing authorization vulnerability in nesquena hermes-webui, published on 30 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Hermes WebUI before 0.51.521 validates the workspace of an imported session under the active named profile but constructs the Session object without setting its profile in the /api/session/import handler, so the imported session is persisted with a null profile. Because a null profile is treated as the default profile by the profile authorization check, a user on the default profile can export the imported session transcript and use its session identifier to read files from the named profile's workspace, defeating the application's profile isolation.
Weakness: CWE-732
Which versions are affected by CVE-2026-58174?
How do I fix CVE-2026-58174?
No fix has been published for CVE-2026-58174 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-2026-58174 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58174 exists.
Sources
Also known as GHSA-8j74-6fjm-pjr7.