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CVE-2026-55196— Hermes WebUI < 0.51.409 - Unauthenticated Passkey Registration via Authentication Bypass

Quick assessment

Affected
hermes-webui 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.

nesquena Hermes WebUI是nesquena的Web服务器。 Nathan Esquenazi Hermes WebUI 0.51.409之前版本存在授权问题漏洞，该漏洞源于认证绕过问题，可能导致未经身份验证的远程攻击者注册任意passkeys。

CVSS 9.1 · Critical EPSS 0.82% · P56

Affected Version Matrix 2

VendorProduct Version RangeStatus
hermes-webui hermes-webui < 0.51.409 affected
0.51.409 unaffected
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I. Basic Information for CVE-2026-55196

Vulnerability Information
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Vulnerability Title
Hermes WebUI < 0.51.409 - Unauthenticated Passkey Registration via Authentication Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Hermes WebUI before 0.51.409 contains an authentication bypass vulnerability in passkey registration endpoints that allows unauthenticated remote attackers to register arbitrary passkeys. When HERMES_WEBUI_PASSKEY=1 is enabled with no existing credentials, POST /api/auth/passkey/register/options and POST /api/auth/passkey/register endpoints are accessible without authentication, allowing attackers to claim the first passkey and gain permanent administrative control.
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:N
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
Nathan Esquenazi Hermes WebUI 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nesquena Hermes WebUI是nesquena的Web服务器。 Nathan Esquenazi Hermes WebUI 0.51.409之前版本存在授权问题漏洞，该漏洞源于认证绕过问题，可能导致未经身份验证的远程攻击者注册任意passkeys。
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
hermes-webui hermes-webui 0 ~ 0.51.409 -

II. Public POCs for CVE-2026-55196

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 11494 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-55196

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Patches & Fixes for CVE-2026-55196 (3)

Vendor Advisories for CVE-2026-55196 (1)

Other References for CVE-2026-55196 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-55196

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