# CVE-2026-58122

## Summary

- **CVE ID:** CVE-2026-58122
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-348
- **Published:** Jul 9, 2026
- **Last Modified:** Jul 14, 2026

## Description

Hermes WebUI before 0.51.307 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to circumvent local-origin IP restrictions on onboarding endpoints by supplying a spoofed X-Forwarded-For header with a loopback address. Attackers can exploit this bypass to perform server-side request forgery against internal services including cloud metadata endpoints, overwrite LLM provider configuration and API keys with attacker-controlled values, or initiate OAuth device-code flows to obtain persistent access tokens stored in auth.json.

## Affected Products

- nesquena — hermes-webui (0)

## References

- [CNA](https://github.com/nesquena/hermes-webui/releases/tag/v0.51.307)
- [CNA](https://github.com/nesquena/hermes-webui/pull/3758)
- [CNA](https://github.com/nesquena/hermes-webui/commit/70596e6993be0d4cee083c1c1a86f5e7ad5d57b7)
- [CNA](https://www.vulncheck.com/advisories/hermes-webui-authentication-bypass-via-x-forwarded-for-header-spoofing)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.37%
- **EPSS Percentile:** 30.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._