CVE-2026-120203 ShowDoc 2.8.14 before 3.9.6 Code Injection via Mock Templates

High 8.7 Published 31 Oct 2026 Updated 6 Nov 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-120203?

CVE-2026-120203 is a high-severity vulnerability in ShowDoc, published on 31 Oct 2026.

Official description

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.

Weakness: CWE-94

Which versions are affected by CVE-2026-120203?

How do I fix CVE-2026-120203?

No fix has been published for CVE-2026-120203 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-120203 being exploited?

There is no known exploitation of CVE-2026-120203 in the wild and no public exploit code.

Sources

Also known as GHSA-fm4v-42hr-rpgp.