CVE-2026-55198

Medium

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.

SeverityMedium

CVSS6.5

Exploit probability—

ProductNesquena Hermes-webui

PublishedJun 17, 2026

First seenJun 17, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

nesquena hermes-webui0.51.443 or later

Patches

Vendor advisories

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

Affected products

Product	Affected versions	Fixed in
nesquena hermes-webui	v < 0.51.443	0.51.443

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.