CVE-2021-44618 Server-side Template Injection in nystudio107/craft-seomatic

What is CVE-2021-44618?

CVE-2021-44618 is a critical code injection vulnerability in n/a, published on 11 Mar 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A Server-side Template Injection (SSTI) vulnerability exists in Nystudio107 Seomatic 3.4.12 in src/helpers/UrlHelper.php via the host header.

Weakness: CWE-94

Which versions are affected by CVE-2021-44618?

2 open source packages ship an affected version, including nystudio107/craft-seomatic. It affects 1 product.

Products include Nystudio107 Seomatic.

How do I fix CVE-2021-44618?

Upgrade nystudio107/craft-seomatic to 3.4.12 or later.

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

Is CVE-2021-44618 being exploited?

There is no known exploitation of CVE-2021-44618 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2021-41749 Code Injection in SEOmatic Critical 9.8
• CVE-2020-12790 SEOmatic for CraftCMS allows Server-Side Template Injection High 7.5
• CVE-2018-14716 SEOmatic plugin for Craft CMS SSTI Vulnerability High 7.5
• CVE-2021-41750 Cross-site Scripting in SEOmatic plugin Medium 6.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-m3xv-x3ph-mq22.