CVE-2026-55197
Hermes WebUI < 0.51.443 - Broken Access Control in /api/session Endpoint
- State
- Published
- Severity
- 7.1 High
- Published
- Jun 17, 2026
- Updated
- Sep 17, 2026
- Reserved
- Jun 16, 2026
Description
Hermes WebUI before 0.51.443 contains a broken access control vulnerability in the /api/session endpoint that allows authenticated users to disclose cross-profile session transcripts. Attackers can bypass profile boundary checks by directly querying session IDs belonging to other profiles via GET /api/session?session_id=<foreign_id>&messages=1 to retrieve unauthorized conversation transcripts and metadata.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-639 Authorization Bypass Through User-Controlled Key
Affected Products
| Product | Versions |
|---|---|
hermes-webuinesquena |
|
References
- hermes-webui v0.51.443 Release Notesrelease-notes
- Researcher Pull Requestissue-trackingpatch
- Maintainer Pull Requestissue-trackingpatch
- Patch Commitpatch
- https://www.vulncheck.com/advisories/hermes-webui-broken-access-control-in-api-session-endpointthird-party-advisory
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