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8.7

ShowDoc allows logged‑in users to run commands

CVE-2026-120203 · published 3 days ago
Summary

If you run ShowDoc version 2.8.14 up to but not including 3.9.6, a feature used for testing can be abused by anyone with a valid account to run operating‑system commands on the server. This can let an attacker take control of the host, especially the official Docker container which runs as the root user. Upgrade ShowDoc to version 3.9.6 or later, or disable the Mock feature if you cannot upgrade.

What to do
  • Update showdoc showdoc to version 3.9.6 or later.
Affected software
VendorProductAffected versions
showdoc showdoc < 3.9.6
Original advisory text
ShowDoc 2.8.14 before 3.9.6 Code Injection via Mock Templates
ShowDoc 2.8.14 before 3.9.6 contains a code injection vulnerability in its Mock feature that allows authenticated users to execute shell commands through mockjs templates. Attackers can store a template via MockController::add with escaped parentheses that mockjs evaluates with eval(), then trigger it through MockController::infoByKey to run commands, as root in the official Docker image.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker full control (estimated)
Severity
8.7 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-94Code Injection
Timeline
Published31 Oct 2026
Updated2 Nov 2026
First seen31 Oct 2026
Sources
CVE-2026-120203 · NVD
CVE-2026-120203 · MITRE
CVE-2026-120203 · OSV
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