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CVE PROGRAM SOURCE RECORD8.8 High

CVE-2026-54721

Silverstripe UserForms: Remote code execution via userforms email subject

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

silverstripe silverstripe-userforms

  • < 6.4.9affected
  • >= 7.0.0, < 7.0.7affected
  • >= 7.1.0, < 7.1.1affected

References