CVE-2026-49973
CriticalCVSS 9.4Exploitation Probability (EPSS)
Low risk22th percentile — higher than 22% of all known CVEs
Summary
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.
Risk Assessment
Attackers 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.
Recommendation
It is recommended to update Hermes WebUI to version 0.51.358 or later to mitigate this vulnerability and implement appropriate access control mechanisms.
Original NVD description (English source)
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.