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CVE-2026-79766— Termix: OS command injection in ACME/Let's Encrypt certificate-request handler via admin-controlled domain/email

Quick assessment

Affected
Termix-SSH Termix
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Termix 是一个基于 Web 的服务器管理平台，具备 SSH 终端、隧道功能和文件编辑功能。在版本 2.4.1 至 2.5.1 之间，已认证的 Termix 管理员可通过调用 接口存储由攻击者控制的域名和电子邮件值，并通过调用 接口触发这些值被插值到 certbot 的 shell 命令中。在 文件中， 以 执行这些值时，仅用双引号进行包裹，因此攻击者可以利用 shell 元字符执行任意操作系统命令，从而以 Termix 后端进程的身份实现远程代码执行。HTTP 验证和 DNS Cloudflare 验证两种挑

CVSS 9.1 · Critical EPSS 0.39% · P30
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I. Basic Information for CVE-2026-79766

Vulnerability Information
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Vulnerability Title
Termix: OS command injection in ACME/Let's Encrypt certificate-request handler via admin-controlled domain/email
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Termix-SSH Termix >= 2.4.1, < 2.5.1 -

II. Public POCs for CVE-2026-79766

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III. Intelligence Information for CVE-2026-79766

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Other References for CVE-2026-79766 (5)

Same Patch Batch · Termix-SSH · 2026-09-24 · 8 CVEs total

CVE-2026-79764 7.7 HIGH Termix: Authenticated SSRF via `/homepage/proxy` — No Destination Allowlist
CVE-2026-79761 6.6 MEDIUM Termix: Command injection in SSH key deployment verification
CVE-2026-79760 6.4 MEDIUM Termix: Authenticated blind SSRF through notification channel test endpoints
CVE-2026-79762 5.5 MEDIUM Termix: Hardcoded default key encrypts all OIDC/WebAuthn users' stored SSH credentials — f
CVE-2026-79758 5.4 MEDIUM Termix: Authenticated users can read other users' host status and clear global SSH connect
CVE-2026-79763 5.3 MEDIUM Termix: MFA-critical operations accept the account password as a sole factor (regression o
CVE-2026-79759 4.3 MEDIUM Termix: Cross-User Information Disclosure via Missing Ownership Check in deploy-to-host En

IV. Related Vulnerabilities

Same product: Termix
Same vendor: Termix-SSH
Same weakness: CWE-78

V. Comments for CVE-2026-79766

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