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.
References
- www.cve.org/CVERecord ↗
- nvd.nist.gov/vuln/detail/CVE-2026-49973 ↗
- github.com/nesquena/hermes-webui/commit/1126e541325d401538f6a272a9c024c37d47ae08 ↗
- github.com/nesquena/hermes-webui/pull/3964 ↗
- github.com/nesquena/hermes-webui/pull/3973 ↗
- github.com/nesquena/hermes-webui/releases/tag/v0.51.358 ↗
- www.vulncheck.com/advisories/hermes-webui-unauthenticated-password-takeover-via-api-settings ↗
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This product uses the NVD API but is not endorsed or certified by the NVD. CVSS scores do not establish exploitation.