# CVE-2026-53871

## Summary

- **CVE ID:** CVE-2026-53871
- **Severity:** HIGH
- **CVSS Score:** 8.6 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-565
- **Published:** Jun 17, 2026
- **Last Modified:** Jul 14, 2026

## 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 (0)
- nesquena — hermes-webui (0.51.368)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.36%
- **EPSS Percentile:** 29.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._