Silverstripe UserForms: Remote code execution via userforms email subject

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-54721
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-27 20:17:49 UTC
Updated2026-09-09 21:09:13 UTC
DescriptionSilverstripe 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

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

EPSS: 0.004150000 probability, percentile 0.349620000 (date 2026-09-10)

Problem Types: CWE-94 | CWE-94 CWE-94: Improper Control of Generation of Code ('Code Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Silverstripe Silverstripe-userforms affected < 6.4.9 Not specified
CNA Silverstripe Silverstripe-userforms affected >= 7.0.0, < 7.0.7 Not specified
CNA Silverstripe Silverstripe-userforms affected >= 7.1.0, < 7.1.1 Not specified

References

ReferenceSourceLinkTags
github.com/silverstripe/silverstripe-userforms/commit/23c069866900c19b49... [email protected] github.com
github.com/silverstripe/silverstripe-userforms/commit/c55494ad7c717b199a... [email protected] github.com
github.com/silverstripe/silverstripe-userforms/releases/tag/7.1.1 [email protected] github.com
github.com/silverstripe/silverstripe-userforms/releases/tag/6.4.9 [email protected] github.com
github.com/silverstripe/silverstripe-userforms/releases/tag/7.0.7 [email protected] github.com
github.com/silverstripe/silverstripe-userforms/pull/1442 [email protected] github.com
github.com/silverstripe/silverstripe-userforms/pull/1441 [email protected] github.com
github.com/silverstripe/silverstripe-userforms/security/advisories/GHSA-... [email protected] github.com
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