RCE in Termix-Ssh Termix
CVE-2026-79766
Termix is a web-based server management platform with SSH terminal, tunneling, and file editing capabilities. From 2.4.1 until 2.5.1, an authenticated Termix administrator can store attacker-controlled domain and email values through PATCH /users/acme-ssl-settings and trigger their interpolation into a certbot shell command through POST /users/acme-ssl-request. In src/backend/database/routes/acme-ssl-routes.ts, child_process.execSync invokes /bin/sh -c with those values only wrapped in double quotes, so shell metacharacters can execute arbitrary operating-system commands as the Termix backend process. Both HTTP webroot and DNS Cloudflare challenge modes are affected, and compromise exposes Termix databases, process secrets, stored credentials, and network reachability. This issue is fixed in version 2.5.1.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (41.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Termix-Ssh Termix — versions >= 2.4.1, < 2.5.1
Weakness classification (CWE)
References
- https://github.com/Termix-SSH/Termix/security/advisories/GHSA-pr55-25gf-5f9v
- https://github.com/Termix-SSH/Termix/pull/1067
- https://github.com/Termix-SSH/Termix/commit/c7a9063a72071153723e668787548766c971f029
- https://github.com/Termix-SSH/Termix/commit/ddbdd5c437c2296607dfaa4265d6f63fbc1ca92e
- https://github.com/Termix-SSH/Termix/releases/tag/release-2.5.1-tag
Frequently asked questions
- What is CVE-2026-79766?
- CVE-2026-79766 is a critical-severity vulnerability in Termix-Ssh Termix, classified under OS Command Injection. CVSS score: 9.1/10. Published 2026-09-24.
- How severe is CVE-2026-79766?
- Critical severity. CVSS v3 base score is 9.1 out of 10.