What’s Vulnerable › Vulnerabilities

CVE-2026-53871: Hermes WebUI < 0.51.368 - Profile-Scoped Authorization Bypass via Forged hermes_profile Cookie

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-17 · updated 2026-10-25
• Weakness: CWE-565

Description

Hermes WebUI before 0.51.368 contains an authorization bypass vulnerability in the get_profile_cookie() function that accepts unauthenticated profile names from the hermes_profile cookie. An authenticated attacker can forge the hermes_profile cookie value to bypass profile-scoped authorization checks and access sessions, files, and resources across different profiles.

Affected products

• nesquena hermes-webui: before 0.51.368 — fixed in 0.51.368

How to fix

Upgrade to a fixed version: nesquena hermes-webui 0.51.368. Check the vendor advisory for mitigations.

References

• https://github.com/nesquena/hermes-webui/commit/9e96f5f6adf93b6d1e27ebddfb4d2833ca06ff3b
• https://github.com/nesquena/hermes-webui/pull/4023
• https://github.com/nesquena/hermes-webui/pull/4036
• https://github.com/nesquena/hermes-webui/releases/tag/v0.51.368
• https://www.vulncheck.com/advisories/hermes-webui-profile-scoped-authorization-bypass-via-forged-hermes-profile-cookie

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