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Vulnerability details

CVE-2026-49973

nesquena hermes-webui

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

CVSS 4.0
9.2Critical

Official 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.

CVSS scores

ScoreVersionSourceVector
9.2Critical 4.0 CVEProject cvelistV5 (CNA) (VulnCheck) 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
9.4Critical 3.1 CVEProject cvelistV5 (CNA) (VulnCheck) CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Affected products

VendorProductVersionsSource
nesquena hermes-webui v < 0.51.358 CVEProject cvelistV5 (CNA)

References and advisories

5
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Details

Published
2026-06-11
Last updated
2026-11-08
State
Published
Assigner (CNA)
VulnCheck

Exploit prediction (EPSS)

0.54%
Probability of exploitation in 30 days
45.8%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
Yes
Exploitation
Proof of concept
Technical impact
Total

Weaknesses (CWE)

  • CWE-306
    Missing Authentication for Critical Function