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CVE-2026-55197— Hermes WebUI < 0.51.443 - Broken Access Control in /api/session Endpoint

Quick assessment

Affected
nesquena hermes-webui
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 0.51.443之前版本存在授权问题漏洞，该漏洞源于/api/session端点存在访问控制漏洞，可能导致经过身份验证的用户通过直接查询其他配置文件的session ID来跨配置文件泄露会话记录。

CVSS 6.5 · Medium EPSS 0.47% · P39

Affected Version Matrix 2

VendorProduct Version RangeStatus
nesquena hermes-webui < 0.51.443 affected
0.51.443 unaffected
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I. Basic Information for CVE-2026-55197

Vulnerability Information
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Vulnerability Title
Hermes WebUI < 0.51.443 - Broken Access Control in /api/session Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Hermes WebUI before 0.51.443 contains a broken access control vulnerability in the /api/session endpoint that allows authenticated users to disclose cross-profile session transcripts. Attackers can bypass profile boundary checks by directly querying session IDs belonging to other profiles via GET /api/session?session_id=<foreign_id>&messages=1 to retrieve unauthorized conversation transcripts and metadata.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
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 0.51.443之前版本存在授权问题漏洞，该漏洞源于/api/session端点存在访问控制漏洞，可能导致经过身份验证的用户通过直接查询其他配置文件的session ID来跨配置文件泄露会话记录。
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 ~ 0.51.443 -

II. Public POCs for CVE-2026-55197

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III. Intelligence Information for CVE-2026-55197

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Patches & Fixes for CVE-2026-55197 (3)

Vendor Advisories for CVE-2026-55197 (1)

Other References for CVE-2026-55197 (1)

Same Patch Batch · nesquena · 2026-06-17 · 3 CVEs total

CVE-2026-53871 8.1 HIGH Hermes WebUI < 0.51.368 - Profile-Scoped Authorization Bypass via Forged hermes_profile Co
CVE-2026-55198 6.5 MEDIUM Hermes WebUI < 0.51.443 - Cross-Profile Session Data Exfiltration via Session Export Endpo

IV. Related Vulnerabilities

Same product: hermes-webui
Same vendor: nesquena
Same weakness: CWE-639

V. Comments for CVE-2026-55197

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