CVE-2026-54721: CWE-94: Improper Control of Generation of Code ('Code Injection') in silverstripe silverstripe-userforms
Description
Silverstripe UserForms versions from 6.0.0 up to but not including 6.4.9, 7.0.7, and 7.1.1 contain a code injection vulnerability in the email recipient subject field. An authenticated CMS user with permission to configure email recipients can inject and execute arbitrary server-side code, impacting confidentiality, integrity, and availability. The issue is fixed in versions 6.4.9, 7.0.7, and 7.1.1.
CVSS v3.1
Score 8.8high
Affected software
silverstripe
silverstripe-userforms
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-54721 is a code injection vulnerability (CWE-94) in Silverstripe UserForms, a visual form builder for Silverstripe CMS. The vulnerability exists in the email recipient subject field, which accepts specially crafted payloads interpreted as executable server-side code. This allows an authenticated CMS user with appropriate permissions to execute arbitrary code on the server. The vulnerability affects versions from 6.0.0 until 6.4.9, 7.0.7, and 7.1.1. The issue is resolved in versions 6.4.9, 7.0.7, and 7.1.1.
Potential Impact
Successful exploitation allows an authenticated CMS user with permission to configure UserForms email recipients to execute arbitrary code on the server, leading to full compromise of confidentiality, integrity, and availability of the affected system.
Mitigation Recommendations
This vulnerability is fixed in Silverstripe UserForms versions 6.4.9, 7.0.7, and 7.1.1. Users should upgrade to one of these versions or later to remediate the issue. No official patch or temporary fix details are provided beyond these version updates. Since this is not a cloud service, remediation depends on user action to upgrade.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-15T23:07:33.231Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a909cf4acd9273b49b2cdd9
Added to database: 08/27/2026, 20:24:20 UTC
Last enriched: 09/08/2026, 10:52:33 UTC
Last updated: 10/10/2026, 18:48:20 UTC
Views: 34
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