CVE-2026-55197

Medium

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.

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

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