9.8

CVE-2026-58123: Hermes WebUI < 0.51.788 Unauthenticated RCE via Terminal API

Deferred
Published 09-07-2026Last modified 14-07-2026

Vulnerability summary

CVE-2026-58123 is a critical (CVSS 9.8) vulnerability in nesquena hermes-webui. EPSS estimates a 4.65% chance of exploitation in the next 30 days, higher than 91.6% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
4.65%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 09-07-2026
    PublishedVulnerability first disclosed.
  2. 14-07-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

4.65%

Chance of exploitation in the next 30 days

Percentile

92%

Versus all other CVEs

30-day change

No change 0.00 pp

From 4.65% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Nesquena1 product

1 vendor · 1 product

References

4 links