Is CVE-2026-55198 actively exploited?

No active exploitation of CVE-2026-55198 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-55198 be exploited remotely?

Yes. CVE-2026-55198 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-55198?

CVE-2026-55198 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2026-55198

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

6.5

CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-55198 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.