Is CVE-2026-55197 actively exploited?

No active exploitation of CVE-2026-55197 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-55197 be exploited remotely?

Yes. CVE-2026-55197 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-55197?

CVE-2026-55197 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2026-55197

CWE-639Published: June 17, 2026· Updated: Jun 17, 2026

6.5

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2026-55197 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 6.5.