PatchTheCVECVE-2026-58123: Hermes WebUI before 0.51.788 contains an unauthenticated remote code execution vulnerability that allows remot
CVE-2026-58123 is a critical-severity flaw (CVSS 9.8) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 req
Why this priority
- Critical severity
- EPSS top 8%: very likely to be exploited
- CISA SSVC: automatable with total technical impact
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 4.6% (top 8%) |
| CISA exploited list | No |
| Weakness | CWE-306 |
| Published | 2026-07-09 |
| Last modified | 2026-10-25 |
Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Timeline
- Published CVE record published
- Updated Record last modified
Exact fixes by distribution
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- Nuclei scan template: Hermes WebUI < 0.51.788 - Remote Code Execution
- Write-up: github.com/nesquena/hermes-webui/pull/5268
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-58123?
No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.
Is CVE-2026-58123 being exploited?
CVE-2026-58123 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-58123 affect?
CVE-2026-58123 affects affected software. Severity is critical (CVSS 9.8). 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 ca
How urgent is CVE-2026-58123?
Priority 65/100. Critical severity; EPSS top 8%: very likely to be exploited; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action