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Vulnerability record · CVE-2026-49959 · published 9 June 2026

CVE-2026-49959: OS command injection vulnerability

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.

8.7 CVSS 4.0 High EPSS 1.3% · top 31.4% CWE-78 · OS command injection Deferred
8.7CVSS 4.0 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
23 Jul 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/nesquena/hermes-webui/commit/938ac9f55b53def1eefb48c4c42dabaf9c22e99c
https://github.com/nesquena/hermes-webui/pull/3776
https://github.com/nesquena/hermes-webui/releases/tag/v0.51.311
https://www.vulncheck.com/advisories/hermes-webui-rce-via-git-configuration-injection

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Source: NIST National Vulnerability Database (record CVE-2026-49959), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.