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CVE-2026-54721— Silverstripe UserForms: Remote code execution via userforms email subject

Quick assessment

Affected
silverstripe silverstripe-userforms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Silverstripe CMS UserForms是Silverstripe CMS组织的一款创建和管理用户表单的组件。 Silverstripe CMS UserForms 6.4.9之前版本、7.0.0至7.0.7之前版本和7.1.0至7.1.1之前版本存在安全漏洞，该漏洞源于CMS中用户表单邮件收件人主题字段接受特制有效载荷，可被解释为可执行服务端代码，导致任意代码执行，影响机密性、完整性和可用性。

CVSS 8.8 · High EPSS 0.73% · P53

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
silverstripe silverstripe-userforms < 6.4.9 affected
>= 7.0.0, < 7.0.7 affected
>= 7.1.0, < 7.1.1 affected
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I. Basic Information for CVE-2026-54721

Vulnerability Information
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Vulnerability Title
Silverstripe UserForms: Remote code execution via userforms email subject
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Silverstripe CMS UserForms 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Silverstripe CMS UserForms是Silverstripe CMS组织的一款创建和管理用户表单的组件。 Silverstripe CMS UserForms 6.4.9之前版本、7.0.0至7.0.7之前版本和7.1.0至7.1.1之前版本存在安全漏洞，该漏洞源于CMS中用户表单邮件收件人主题字段接受特制有效载荷，可被解释为可执行服务端代码，导致任意代码执行，影响机密性、完整性和可用性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
silverstripe silverstripe-userforms < 6.4.9 -

II. Public POCs for CVE-2026-54721

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III. Intelligence Information for CVE-2026-54721

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Patches & Fixes for CVE-2026-54721 (4)

Vendor Advisories for CVE-2026-54721 (1)

Vendor Pages for CVE-2026-54721 (3)

IV. Related Vulnerabilities

Same vendor: silverstripe
Same weakness: CWE-94

V. Comments for CVE-2026-54721

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