CVE-2026-49973

CRITICAL EPSS 41.5%
Published Jun 11, 20262w ago · Modified Jun 17, 20262w ago
9.2 CVSS 4.0
Critical
Find Similar
Published Jun 11, 2026 2w ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
9.2
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
41.5% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-306 Missing Authentication for Critical Function Authentication

References 5

  • github.com https://github.com/nesquena/hermes-webui/commit/1126e541325d401538f6a272a9c024c37d47ae08
  • github.com https://github.com/nesquena/hermes-webui/pull/3964
  • github.com https://github.com/nesquena/hermes-webui/pull/3973
  • github.com https://github.com/nesquena/hermes-webui/releases/tag/v0.51.358
  • vulncheck.com https://www.vulncheck.com/advisories/hermes-webui-unauthenticated-password-takeover-via-api-settings

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.