CVE-2026-49959: Nesquena Hermes-Webui

High severity, CVSS 8.8. EPSS: 1.3% chance of exploitation in the next 30 days.

Hermes WebUI before version 0.51.311 contains a remote code execution vulnerability that allows authenticated attackers to execute arbitrary commands by placing malicious executable Git configuration in a workspace repository's .git/config file. Attackers can exploit Git subprocess invocations in api/workspace_git.py through vectors such as core.fsmonitor during git status, protocol.ext.allow with ext:: remotes during git fetch, credential.helper, core.askPass, core.gitProxy, or inherited environment variables including GIT_SSH_COMMAND to achieve arbitrary command execution on the host running the application.

Affected products

• Nesquena Hermes-Webui: before 0.51.311 (fixed in 0.51.311)

Published 2026-06-09. Last modified 2026-07-23.