In short
- CVE-2026-54721 is a HIGH (CVSS 8.8) vulnerability affecting silverstripe/userforms.
- Chance of exploitation in the next 30 days (EPSS): 0.73%, higher than 54.4% of all vulnerabilities.
- Fix: update to 7.0.7, 7.1.1, 6.4.9 or later.
| Package | Affected versions | Patched versions |
|---|
| silverstripe/userforms Packagist | ≥ 7.0.0, < 7.0.7≥ 7.1.0, < 7.1.1< 6.4.9
| 7.0.77.1.16.4.9
|
Description
Impact
The userform email subject field in the CMS is vulnerable to a specially crafted payload being used to run arbitrary code on the server.
Reported by
Jack Wallace from Bastion Security
NVD 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.
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