CVE-2026-58123: Nesquena Hermes-Webui

Critical severity, CVSS 9.8. EPSS: 4.6% chance of exploitation in the next 30 days.

Hermes WebUI before 0.51.788 contains an unauthenticated remote code execution vulnerability that allows remote attackers to execute arbitrary shell commands by accessing the embedded terminal API endpoints without credentials. Attackers can create a session, attach a PTY shell, and write arbitrary commands through the terminal input endpoint to achieve full command execution as the server process user via four sequential unauthenticated HTTP requests.

Affected products

• Nesquena Hermes-Webui: before 0.51.788 (fixed in 0.51.788)

Published 2026-07-09. Last modified 2026-07-14.