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CVE-2026-55198— Hermes WebUI < 0.51.443 - Cross-Profile Session Data Exfiltration via Session Export 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，该漏洞源于会话导出端点存在授权绕过，未能验证活动配置文件所有权，允许经过身份验证的用户访问其他配置文件的会话。

CVSS 6.5 · Medium EPSS 0.47% · P39

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

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-2026-55198

Vulnerability Information
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Vulnerability Title
Hermes WebUI < 0.51.443 - Cross-Profile Session Data Exfiltration via Session Export Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Hermes WebUI before 0.51.443 contains an authorization bypass vulnerability in the session export endpoint that allows authenticated users to access sessions from other profiles. The _handle_session_export handler in api/routes.py fails to verify active-profile ownership before serializing session data, enabling attackers to exfiltrate foreign session transcripts by guessing or knowing session identifiers.
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，该漏洞源于会话导出端点存在授权绕过，未能验证活动配置文件所有权，允许经过身份验证的用户访问其他配置文件的会话。
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-2026-55198

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III. Intelligence Information for CVE-2026-55198

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Patches & Fixes for CVE-2026-55198 (3)

Vendor Advisories for CVE-2026-55198 (1)

Other References for CVE-2026-55198 (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-2026-55197 6.5 MEDIUM Hermes WebUI < 0.51.443 - Broken Access Control in /api/session Endpoint

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-55198

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