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CVE-2026-49973— Hermes WebUI < 0.51.358 Unauthenticated Password Takeover via /api/settings

Quick assessment

Affected
nesquena hermes-webui
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hermes Web UI是Nathan Esquenazi个人开发者的一个轻量级、暗色主题的自主智能体Web界面。 Hermes Web UI 0.51.358之前版本存在访问控制错误漏洞，该漏洞源于访问控制不当，可能导致未经身份验证的远程攻击者通过向设置API端点提交_set_password参数劫持初始设置。攻击者可在首次运行设置窗口期间发送POST请求，持久化任意密码哈希，获取有效会话cookie，并锁定合法操作员。

CVSS 9.4 · Critical EPSS 0.73% · P53

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services

Affected Version Matrix 1

VendorProduct Version RangeStatus
nesquena hermes-webui < 0.51.358 affected
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I. Basic Information for CVE-2026-49973

Vulnerability Information
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Vulnerability Title
Hermes WebUI < 0.51.358 Unauthenticated Password Takeover via /api/settings
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Hermes Web UI 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hermes Web UI是Nathan Esquenazi个人开发者的一个轻量级、暗色主题的自主智能体Web界面。 Hermes Web UI 0.51.358之前版本存在访问控制错误漏洞，该漏洞源于访问控制不当，可能导致未经身份验证的远程攻击者通过向设置API端点提交_set_password参数劫持初始设置。攻击者可在首次运行设置窗口期间发送POST请求，持久化任意密码哈希，获取有效会话cookie，并锁定合法操作员。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nesquena hermes-webui 0 ~ 0.51.358 -

II. Public POCs for CVE-2026-49973

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6369 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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POC zip download
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III. Intelligence Information for CVE-2026-49973

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Patches & Fixes for CVE-2026-49973 (3)

Vendor Advisories for CVE-2026-49973 (1)

Vendor Pages for CVE-2026-49973 (1)

IV. Related Vulnerabilities

Same product: hermes-webui
Same vendor: nesquena
Same weakness: CWE-306

V. Comments for CVE-2026-49973

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