CVE-2026-54721: silverstripe/userforms vulnerable to remote code execution via userforms email subject

high Affects silverstripe/userforms. Feed 2026.10.29.1, updated 2026-10-28; published 2026-08-27.

silverstripe/userforms vulnerable to remote code execution via userforms email subject

Package: silverstripe/userforms Composer
Affected versions: <6.4.9 or >=7.0.0 and <7.0.7 or >=7.1.0 and <7.1.1
Fixed in: 6.4.9, 7.0.7, 7.1.1
Severity: high CVSS 8.8
Exploitation: not on CISA KEV · EPSS 1% (54.2th percentile)
Published: 2026-08-27
Source: osv.dev

References

NVD record silverstripe/userforms 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.

# one-time install
pip install phpwarden

# then
phpwarden deps composer.lock

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

Install docs How findings are ranked

Related advisories

CVE-2020-9280 high SilverStripe Folders migrated from 3.x may be unsafe to upload to same package: silverstripe/userforms
GHSA-55pp-293f-3365 medium silverstripe/userforms file upload exposure on UserForms module same package: silverstripe/userforms
SS-2015-018-1 unknown SS-2015-018: File upload exposure on UserForms module same package: silverstripe/userforms
CVE-2018-7600 KEV critical A remote code execution vulnerability exists within multiple subsystems of Drupal 7.x and same weakness: CWE-20
CVE-2022-24086 KEV critical Magento improper input validation vulnerability same weakness: CWE-20
CVE-2025-54236 KEV critical Magento Community Edition Improper Input Validation vulnerability same weakness: CWE-20