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Description

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.

PUBLISHED Reserved 2026-06-29 | Published 2026-07-09 | Updated 2026-07-14 | Assigner VulnCheck




CRITICAL: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

Missing Authentication for Critical Function

Product status

Default status
affected

Any version before 0.51.788
affected

Credits

Katriel Moses finder

VulnCheck finder

References

github.com/nesquena/hermes-webui/releases/tag/v0.51.788 (Release Notes) release-notes

github.com/nesquena/hermes-webui/pull/5268 (Pull Request) issue-tracking

github.com/...ommit/d257e5f36cfa9328600c8bde6f0de09a6ad9b6f4 (Patch Commit) patch

www.vulncheck.com/...ui-unauthenticated-rce-via-terminal-api third-party-advisory

cve.org (CVE-2026-58123)

nvd.nist.gov (CVE-2026-58123)

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