CVE-2026-49973 Details
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.
A vulnerability in Hermes WebUI versions prior to 0.51.358 allows unauthenticated remote attackers to hijack the initial setup process. This is achieved by sending the '_set_password' parameter to the settings API endpoint without any network origin restrictions. During the first-run setup window, attackers can persist an arbitrary password hash, obtain a valid session cookie, and lock out the legitimate operator from their instance.
Users can update to Hermes WebUI version 0.51.358 or later, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 11, 2026CISA-ADP
Assessed Jun 13, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/nesquena/hermes-webui/pull/3964 | CISA-ADP | Issue TrackingSource CodeVendor |
| https://github.com/nesquena/hermes-webui/commit/1126e541325d401538f6a272a9c024c37d47ae08 | [email protected] | Source CodeVendor |
| https://github.com/nesquena/hermes-webui/pull/3964 | [email protected] | Issue TrackingSource CodeVendor |
| https://github.com/nesquena/hermes-webui/pull/3973 | [email protected] | Source CodeVendor |
| https://github.com/nesquena/hermes-webui/releases/tag/v0.51.358 | [email protected] | Release NotesVendor |
| https://www.vulncheck.com/advisories/hermes-webui-unauthenticated-password-takeover-via-api-settings | [email protected] | AdvisoryRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-306 | Missing Authentication for Critical Function | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Hermes WebUI | < 0.51.358 (semver) |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 14, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 13, 2026 | CVE Modified | CISA-ADP |
| Jun 11, 2026 | New CVE Received | [email protected] |