CVE-2026-55198

HIGH7.1

Hermes WebUI < 0.51.443 - Cross-Profile Session Data Exfiltration via Session Export Endpoint

Published Jun 17, 2026

Modified 6 days ago

Details

Hermes WebUI before 0.51.443 contains an authorization bypass vulnerability in the session export endpoint that allows authenticated users to access sessions from other profiles. The _handle_session_export handler in api/routes.py fails to verify active-profile ownership before serializing session data, enabling attackers to exfiltrate foreign session transcripts by guessing or knowing session identifiers.

References

FIX

https://github.com/nesquena/hermes-webui/commit/2a3baa71b81ca92da8ece8616a09f15894beec71

DETECTION

https://github.com/nesquena/hermes-webui/pull/3991

WEB

https://github.com/nesquena/hermes-webui/pull/4269

WEB

https://github.com/nesquena/hermes-webui/releases/tag/v0.51.443

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-55198

ADVISORY