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TI-2026-41856 Aliases CVE-2026-58122GHSA-rfj2-6v8r-3w64

Hermes WebUI < 0.51.307 Authentication Bypass via X-Forwarded-For Header Spoofing

Priority MEDIUM 48CWE-348Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00373 31st percentileScored 2026-11-07
Fix Fixed hermes-webui (nesquena): 0.51.307

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nesquenahermes-webuibefore 0.51.3070.51.307Patch availableCNA
  • hermes-webui Vendornesquena Affected before 0.51.307 Fixed in 0.51.307 Patch available CNA

Remediation

  • Fix · CNA hermes-webui (nesquena) Fixed in 0.51.307

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-58122
  2. 2026-10-03 Alias added: GHSA-rfj2-6v8r-3w64

References

Patch 1

Other 2

  • TI-2026-36807 Hermes WebUI < 0.51.358 Unauthenticated Password Takeover via /api/settings CVSS 4.0CRITICAL 9.2
  • TI-2026-39885 Hermes WebUI < 0.51.468 - Resource Exhaustion via Unauthenticated OAuth Flow Endpoint CVSS 4.0MEDIUM 6.9
  • TI-2026-39878 Hermes WebUI < 0.51.443 - Cross-Profile Session Data Exfiltration via Session Export Endpoint CVSS 4.0HIGH 7.1
  • TI-2026-39877 Hermes WebUI < 0.51.443 - Broken Access Control in /api/session Endpoint CVSS 4.0HIGH 7.1
  • TI-2026-36799 Hermes WebUI < 0.51.269 Profile Isolation Bypass via sessions search CVSS 4.0HIGH 7.1
  • TI-2026-09773 Hermes WebUI before 0.51.221 Path Traversal via Symlink Workspace Bypass CVSS 4.0HIGH 7.1
See all 16 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences