CVE-2021-40219 Code Injection in Bolt CMS

Q: Which versions are affected by CVE-2021-40219?

2 open source packages ship an affected version, including bolt/core. It affects 1 product.

Q: Is CVE-2021-40219 being exploited?

There is no known exploitation of CVE-2021-40219 in the wild and no public exploit code.

Q: How do I fix CVE-2021-40219?

No fix has been published for CVE-2021-40219 yet. Limit exposure of the affected software until one is available.

High 8.8 Published 11 Apr 2022 Updated 9 Jul 2026

An authenticated attacker can inject server-side templates into themes to achieve remote code execution in Bolt CMS.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-40219?

CVE-2021-40219 is a high-severity code injection vulnerability in n/a, published on 11 Apr 2022. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Bolt CMS <= 4.2 is vulnerable to Remote Code Execution. Unsafe theme rendering allows an authenticated attacker to edit theme to inject server-side template injection that leads to remote code execution.

Weakness: CWE-94

Which versions are affected by CVE-2021-40219?

2 open source packages ship an affected version, including bolt/core. It affects 1 product.

Package	Affected	Fixed in
`bolt/core` Packagist	All versions to `4.2`	None
`bolt/core` Packagist	All versions to `4.2`	None

Products include Bolt Bolt Cms.

How do I fix CVE-2021-40219?

No fix has been published for CVE-2021-40219 yet. Limit exposure of the affected software until one is available.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2021-40219 being exploited?

There is no known exploitation of CVE-2021-40219 in the wild and no public exploit code.

Sources

Also known as GHSA-gprh-7767-cw39.