GitHub Advisoryadvisory · Packagist
GHSA-g8wr-r2v2-vqc6 silverstripe/userforms vulnerable to remote code execution via userforms email subject
HIGH
Official page ↗
- Aliases
- CVE-2026-54721
- Ecosystem
- Packagist
- Packages
- silverstripe/userforms
- Severity
- High
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-20, CWE-94
- Reviewed
- 2026-08-27
Affected packages
• Packagist silverstripe/userforms: < 6.4.9 → fixed in 6.4.9
• Packagist silverstripe/userforms: >= 7.0.0, < 7.0.7 → fixed in 7.0.7
• Packagist silverstripe/userforms: >= 7.1.0, < 7.1.1 → fixed in 7.1.1
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
Related
Alias · CVE (1)
- CVE-2026-54721 Silverstripe UserForms provides a visual form builder for the Silverstripe CMS. vulnerability
References
- https://github.com/silverstripe/silverstripe-userforms/security/advisories/GHSA-g8wr-r2v2-vqc6 web
- https://github.com/silverstripe/silverstripe-userforms/pull/1441 web
- https://github.com/silverstripe/silverstripe-userforms/pull/1442 web
- https://github.com/silverstripe/silverstripe-userforms/commit/23c069866900c19b499bfa997d1e251e97491702 web
- https://github.com/silverstripe/silverstripe-userforms/commit/c55494ad7c717b199a3c1663b43a54db5d95604c web
- https://github.com/FriendsOfPHP/security-advisories/blob/master/silverstripe/userforms/CVE-2026-54721.yaml web
- https://github.com/silverstripe/silverstripe-userforms package
- https://github.com/silverstripe/silverstripe-userforms/releases/tag/6.4.9 web
- https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.0.7 web
- https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.1.1 web
- https://www.silverstripe.org/download/security-releases/cve-2026-54721 web