CVE-2026-49973

Critical

Description

Hermes WebUI before version 0.51.358 contains an improper access control vulnerability that allows unauthenticated remote attackers to hijack initial setup by submitting the _set_password parameter to the settings API endpoint without any network origin restriction. Attackers on any reachable network can send a POST request to the settings endpoint during the first-run setup window to persist an arbitrary password hash, obtain a valid session cookie, and lock out the legitimate operator from their own instance.

SeverityCritical

CVSS9.4

Exploit probability—

ProductNesquena Hermes-webui

PublishedJun 11, 2026

First seenJun 11, 2026

Weakness typeCWE-306Missing authentication for critical function

How to fix

Update

nesquena hermes-webui0.51.358 or later

Patches

github.com/nesquena/hermes-webui/commit/1126e541325d401538f6a272a9c024c37d47ae08

Vendor advisories

github.com/nesquena/hermes-webui/releases/tag/v0.51.358

Affected products

Product	Affected versions	Fixed in
nesquena hermes-webui	v < 0.51.358	0.51.358

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