CVE-2026-54721: high-severity vulnerability in silverstripe-userforms
Silverstripe UserForms: Remote code execution via userforms email subject
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8epss 0.7%
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
silverstripe · silverstripe-userformsReferences
https://github.com/silverstripe/silverstripe-userforms/commit/23c069866900c19b499bfa997d1e251e97491702https://github.com/silverstripe/silverstripe-userforms/commit/c55494ad7c717b199a3c1663b43a54db5d95604chttps://github.com/silverstripe/silverstripe-userforms/pull/1441https://github.com/silverstripe/silverstripe-userforms/pull/1442https://github.com/silverstripe/silverstripe-userforms/releases/tag/6.4.9https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.0.7https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.1.1https://github.com/silverstripe/silverstripe-userforms/security/advisories/GHSA-g8wr-r2v2-vqc6