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Vulnerabilities CVE-2026-49973

CVE-2026-49973

Critical
Open
TLP:CLEAR

Hermes WebUI < 0.51.358 Unauthenticated Password Takeover via /api/settings

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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.

Details

CVSS Score
9.2
EPSS Score
0.54%

43.1th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
Confidence
90%
Published
Jun 11, 2026
Last Modified
Jul 14, 2026
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