CVE-2026-44011: Craft CMS has Potential Authenticated Remote Code Execution via Malicious Attached Behavior

high Affects craftcms/cms. Feed 2026.10.29.3, updated 2026-10-29; published 2026-05-06; advisory modified 2026-05-13.

Craft CMS has Potential Authenticated Remote Code Execution via Malicious Attached Behavior

Package: craftcms/cms Composer
Affected versions: >=4.0.0 and <4.17.12 or >=5.0.0 and <5.9.18
Fixed in: 4.17.12, 5.9.18
Severity: high
Exploitation: not on CISA KEV · EPSS 1% (49.6th percentile)
Published: 2026-05-06
Source: osv.dev

References

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

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