CVE-2026-49973
Hermes WebUI < 0.51.358 Unauthenticated Password Takeover via /api/settings
- State
- Published
- Severity
- 9.2 Critical
- Published
- Jun 11, 2026
- Updated
- Jul 14, 2026
- Reserved
- Jun 2, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.2 Critical | 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 | VulnCheck |
| 3.1 | 9.4 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L | VulnCheck |
Weaknesses
- CWE-306 Missing Authentication for Critical Function
Affected Products
| Product | Versions |
|---|---|
hermes-webuinesquena |
|
References
- https://github.com/nesquena/hermes-webui/releases/tag/v0.51.358release-notes
- https://github.com/nesquena/hermes-webui/pull/3964issue-tracking
- https://github.com/nesquena/hermes-webui/pull/3973issue-tracking
- https://github.com/nesquena/hermes-webui/commit/1126e541325d401538f6a272a9c024c37d47ae08patch
- https://www.vulncheck.com/advisories/hermes-webui-unauthenticated-password-takeover-via-api-settingsthird-party-advisory
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