Which products and versions are affected by CVE-2026-58123?

Affected: hermes-webui. The full list is in the CVE brief.

Is CVE-2026-58123 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2026-58123 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2026-58123?

No public exploit code is known.

Is there a fix for CVE-2026-58123?

Fixed versions are available, including hermes-webui 0.51.788.

How urgently should CVE-2026-58123 be patched?

Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.

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Vulnerability Intelligence

CVE-2026-58123

Critical

Published Jul 9, 2026 · Updated Oct 15, 2026 · Also known as EUVD-2026-42722

Key Facts

Patch in the next maintenance window

CVE-2026-58123 is a critical-severity vulnerability (CVSS 9.3 v4) affecting hermes-webui.
It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
EPSS estimates a 4.6% probability of exploitation in the next 30 days.
Fixed versions are available, including hermes-webui 0.51.788.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.

CVSS v4

9.3

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

EPSS (30-day exploit likelihood)

4.6%

Higher than 91.6% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

None known

Get the full CVE-2026-58123 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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.

Affected Products

1 affected entries in total

Product	Affected versions	Fixed in
hermes-webui	See advisory	0.51.788

Patched Releases

hermes-webui

0.51.788

Timeline

Publicly disclosed
Jul 9, 2026
Last updated
Oct 15, 2026

Weakness Type

CWE-306 Missing Authentication for Critical Function

References

advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58123.json
advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-58123
otherhttps://github.com/nesquena/hermes-webui
otherPatch Commit
otherPull Request

2 more references in the full CVE brief

FAQ

Common Questions.

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.
Affected: hermes-webui. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including hermes-webui 0.51.788.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.

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