CVE-2026-55197
Hermes WebUI < 0.51.443 - Broken Access Control in /api/session Endpoint
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.
INFO
Published Date :
June 17, 2026, 5:59 p.m.
Last Modified :
June 17, 2026, 5:59 p.m.
Remotely Exploit :
Yes !
Source :
VulnCheck
Affected Products
The following products are affected by CVE-2026-55197
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 |
Solution
- Update Hermes WebUI to version 0.51.443 or later.
- Restrict access to the /api/session endpoint.
- Implement strict profile boundary checks.
- Validate all session ID requests.
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CVE-2026-55197 vulnerability anywhere in the article.