CVE-2026-55794: Craft CMS: Potential authenticated Remote Code Execution via referrer redirect

high Affects craftcms/cms. Feed 2026.10.29.1, updated 2026-10-28; published 2026-07-06; advisory modified 2026-09-10.

Craft CMS: Potential authenticated Remote Code Execution via referrer redirect

Package: craftcms/cms Composer
Affected versions: >=5.9.0 and <5.10.0
Fixed in: 5.10.0
Severity: high
Exploitation: not on CISA KEV · EPSS 0% (35.3th percentile)
Published: 2026-07-06
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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