CVE-2021-41749: Code Injection in SEOmatic

critical Affects nystudio107/craft-seomatic. Feed 2026.10.29.4, updated 2026-10-29; published 2022-06-13; advisory modified 2023-11-08.

Code Injection in SEOmatic

Package: nystudio107/craft-seomatic Composer
Affected versions: <3.4.11
Fixed in: 3.4.11
Severity: critical CVSS 9.8
Exploitation: not on CISA KEV · EPSS 17% (97.0th percentile)
Published: 2022-06-13
Source: osv.dev

References

CWE-94

NVD record nystudio107/craft-seomatic advisories

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden deps composer.lock

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pipx install phpwarden   &&   phpwarden deps composer.lock

Or keep it checked automatically: GitHub Action · pre-commit hook · GitLab CI · Laravel artisan command

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Related advisories

CVE-2020-9757 critical SEOmatic for CraftCMS allows Server-Side Template Injection same package: nystudio107/craft-seomatic
CVE-2018-14716 high SEOmatic plugin for Craft CMS SSTI Vulnerability same package: nystudio107/craft-seomatic
CVE-2020-12790 high SEOmatic for CraftCMS allows Server-Side Template Injection same package: nystudio107/craft-seomatic
CVE-2021-44618 critical Server-side Template Injection in nystudio107/craft-seomatic same package: nystudio107/craft-seomatic
CVE-2021-41750 medium Cross-site Scripting in SEOmatic plugin same package: nystudio107/craft-seomatic
2020-04-28-1 unknown SSTI Vulnerability same package: nystudio107/craft-seomatic