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TI-2026-36807 Aliases CVE-2026-49973GHSA-p52p-4vmg-4vq3

Hermes WebUI < 0.51.358 Unauthenticated Password Takeover via /api/settings

Priority HIGH 81CWE-306Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306.

Summary

Hermes WebUI before version 0.51.358 contains an improper access control vulnerability that allows unauthenticated remote attackers to hijack initial setup by submitting the _set_password parameter to the settings API endpoint without any network origin restriction. Attackers on any reachable network can send a POST request to the settings endpoint during the first-run setup window to persist an arbitrary password hash, obtain a valid session cookie, and lock out the legitimate operator from their own instance.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00543 45th percentileScored 2026-11-07
Fix Fixed hermes-webui (nesquena): 0.51.358

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
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 0.51.3580.51.358Patch availableCNA
  • hermes-webui Vendornesquena Affected before 0.51.358 Fixed in 0.51.358 Patch available CNA

Remediation

  • Fix · CNA hermes-webui (nesquena) Fixed in 0.51.358

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-49973
  2. 2026-10-03 Alias added: GHSA-p52p-4vmg-4vq3
  3. 2026-10-25 EPSS moved to the below the 50th percentile

References

Patch 3

Other 1

  • 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
  • TI-2026-41892 Hermes WebUI < 0.51.521 - Cross-Profile Authorization Bypass via Unset Session Profile on Import CVSS 4.0MEDIUM 6.0
See all 16 →

Sources

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