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Vulnerability record · CVE-2026-58123 · published 9 July 2026

CVE-2026-58123: Missing authentication for critical function vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 4.6% · top 8.6% CWE-306 · Missing authentication for critical function Deferred
9.3CVSS 4.0 base score
4.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
14 Jul 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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/d257e5f36cfa9328600c8bde6f0de09a6ad9b6f4
https://github.com/nesquena/hermes-webui/pull/5268
https://github.com/nesquena/hermes-webui/releases/tag/v0.51.788
https://www.vulncheck.com/advisories/hermes-webui-unauthenticated-rce-via-terminal-api

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Source: NIST National Vulnerability Database (record CVE-2026-58123), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.