CVE-2026-54721
HighCVSS 8.8Summary
Silverstripe UserForms, from 6.0.0 until 6.4.9, 7.0.7, and 7.1.1, has a vulnerability in the email recipient subject field. A specially crafted payload can be interpreted as executable server-side code. An authenticated CMS user with permission to configure a UserForms email recipient can run arbitrary code on the server, compromising confidentiality, integrity, and availability. Fixed in versions 6.4.9, 7.0.7, and 7.1.1.
Risk Assessment
The risk includes remote code execution by an authenticated user, potentially leading to full server and data compromise.
Recommendation
It is recommended to upgrade Silverstripe UserForms to version 6.4.9, 7.0.7, or 7.1.1 or later.
Original NVD description (English source)
Silverstripe UserForms provides a visual form builder for the Silverstripe CMS. From 6.0.0 until 6.4.9, 7.0.7, and 7.1.1, the userform email recipient subject field in the CMS accepts a specially crafted payload that can be interpreted as executable server-side code. An authenticated CMS user with permission to configure a UserForms email recipient can use the subject field to run arbitrary code on the server, compromising confidentiality, integrity, and availability. This issue is fixed in versions 6.4.9, 7.0.7, and 7.1.1.