CVE-2026-49973
Hermes WebUI < 0.51.358 Unauthenticated Password Takeover via /api/settings
CVSS Score
9.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-306 |
| Vendor | nesquena |
| Product | hermes-webui |
| Published | Jun 11, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low
Affected Versions
nesquena / hermes-webui
0 < 0.51.358
References
github.com: https://github.com/nesquena/hermes-webui/releases/tag/v0.51.358 github.com: https://github.com/nesquena/hermes-webui/pull/3964 github.com: https://github.com/nesquena/hermes-webui/pull/3973 github.com: https://github.com/nesquena/hermes-webui/commit/1126e541325d401538f6a272a9c024c37d47ae08 vulncheck.com: https://www.vulncheck.com/advisories/hermes-webui-unauthenticated-password-takeover-via-api-settings
Credits
Chia Min Jun Lennon