CVE-2026-49973

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 v3 9.4 CRITICAL

9.4^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact LOW

Scope UNCHANGED

References

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

Configurations

No configuration.

History

No history.

Information

Published : 2026-06-11 20:16

Updated : 2026-07-14 22:17

NVD link : CVE-2026-49973

Mitre link : CVE-2026-49973

CVE.ORG link : CVE-2026-49973

JSON object : View

Products Affected

No product.

CWE

CWE-306

Missing Authentication for Critical Function

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