silverstripe/silverstripe-userforms · Security
silverstripe/userforms vulnerable to remote code execution via userforms email subject
- GHSA ID
- GHSA-g8wr-r2v2-vqc6
- CVE ID
- CVE-2026-54721
- Severity
- high
- Published
- Updated
- CVSS
- 8.8 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CVSS v3
- 8.8 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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
CWEs
- CWE-20 · Improper Input Validation
- CWE-94 · Improper Control of Generation of Code ('Code Injection')
References
- https://github.com/silverstripe/silverstripe-userforms/security/advisories/GHSA-g8wr-r2v2-vqc6 ↗
- https://github.com/silverstripe/silverstripe-userforms/pull/1441 ↗
- https://github.com/silverstripe/silverstripe-userforms/pull/1442 ↗
- https://github.com/silverstripe/silverstripe-userforms/commit/23c069866900c19b499bfa997d1e251e97491702 ↗
- https://github.com/silverstripe/silverstripe-userforms/commit/c55494ad7c717b199a3c1663b43a54db5d95604c ↗
- https://github.com/FriendsOfPHP/security-advisories/blob/master/silverstripe/userforms/CVE-2026-54721.yaml ↗
- https://github.com/silverstripe/silverstripe-userforms/releases/tag/6.4.9 ↗
- https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.0.7 ↗
- https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.1.1 ↗
- https://www.silverstripe.org/download/security-releases/cve-2026-54721 ↗
- https://github.com/advisories/GHSA-g8wr-r2v2-vqc6 ↗