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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
nesquena hermes-webui affected
Version Status Constraints
0 affected < 0.51.358

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/nesquena/hermes-webui/commit/1126e541325d401538f6a272a9c024c37d47ae08 cve-icon cve-icon
https://github.com/nesquena/hermes-webui/pull/3964 cve-icon cve-icon
https://github.com/nesquena/hermes-webui/pull/3973 cve-icon cve-icon
https://github.com/nesquena/hermes-webui/releases/tag/v0.51.358 cve-icon cve-icon
https://www.vulncheck.com/advisories/hermes-webui-unauthenticated-password-takeover-via-api-settings cve-icon cve-icon
History

Thu, 11 Jun 2026 20:00:00 +0000

Type Values Removed Values Added
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.
Title Hermes WebUI < 0.51.358 Unauthenticated Password Takeover via /api/settings
Weaknesses CWE-306
References
Metrics cvssV3_1

{'score': 9.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L'}

cvssV4_0

{'score': 9.2, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-06-11T19:04:08.505Z

Reserved: 2026-06-02T16:30:15.234Z

Link: CVE-2026-49973

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-06-11T20:16:25.050

Modified: 2026-06-11T20:50:49.480

Link: CVE-2026-49973

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-11T22:15:09Z

Weaknesses