CVE-2026-49973CWE-306

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

Critical · published June 11, 2026

CVSS v4.0
9.2
EPSS
1%
Percentile
53.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
9.2 · CRITICAL
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
EPSS
0.00731 · 53.8th percentile
Weakness
CWE-306 · Missing Authentication for Critical Function
Published
2026-06-11T19:04Z
EPSS history
Timeline
  • 11 JUN 19:04Z
    Hermes WebUI < 0.51.358 Unauthenticated Password Takeover via /api/settings
    cvelistv5