CVE-2026-54721

HIGH 8.8

Silverstripe UserForms: Remote code execution via userforms email subject

CVSS Score

8.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-94
Vendor	silverstripe
Product	silverstripe-userforms
Published	Aug 27, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

silverstripe / silverstripe-userforms

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

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/silverstripe/silverstripe-userforms/security/advisories/GHSA-g8wr-r2v2-vqc6 github.com: https://github.com/silverstripe/silverstripe-userforms/pull/1441 github.com: https://github.com/silverstripe/silverstripe-userforms/pull/1442 github.com: https://github.com/silverstripe/silverstripe-userforms/commit/23c069866900c19b499bfa997d1e251e97491702 github.com: https://github.com/silverstripe/silverstripe-userforms/commit/c55494ad7c717b199a3c1663b43a54db5d95604c github.com: https://github.com/silverstripe/silverstripe-userforms/releases/tag/6.4.9 github.com: https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.0.7 github.com: https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.1.1