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Vulnerability record · CVE-2026-49973 · published 11 June 2026

CVE-2026-49973: Missing authentication for critical function vulnerability

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.

9.2 CVSS 4.0 Critical EPSS 0.73% · top 47.6% CWE-306 · Missing authentication for critical function Deferred
9.2CVSS 4.0 base score
0.73%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
14 Jul 2026Last modified by NVD

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: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:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-49973), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.