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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
silverstripe silverstripe-userforms affected
Version Status Constraints
< 6.4.9 affected —
>= 7.0.0, < 7.0.7 affected —
>= 7.1.0, < 7.1.1 affected —

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Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-g8wr-r2v2-vqc6 silverstripe/userforms vulnerable to remote code execution via userforms email subject
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

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

Thu, 27 Aug 2026 18:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Silverstripe UserForms: Remote code execution via userforms email subject
Weaknesses CWE-94
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-08-27T16:52:46.023Z

Reserved: 2026-06-15T23:07:33.231Z

Link: CVE-2026-54721

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-27T20:17:49.973

Modified: 2026-08-27T20:17:49.973

Link: CVE-2026-54721

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses