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.
以下是该漏洞描述的中文翻译： Silverstripe UserForms 为 Silverstripe CMS 提供了一个可视化的表单构建器。在 6.0.0 至 6.4.8、7.0.7 和 7.1.1 之前的版本中，CMS 中 UserForms 邮件接收人的“主题”字段接受一个精心构造的载荷，该载荷可被解释为可执行的服务器端代码。拥有配置 UserForms 邮件接收人权限的已认证 CMS 用户可以利用“主题”字段在服务器上执行任意代码，从而危及系统的机密性、完整性和可用性。该问题已在 6.4.9、7.0.7
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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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
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| silverstripe | silverstripe-userforms | < 6.4.9 | - |
|
II. Public POCs for CVE-2026-54721
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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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)
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🔗 Release 6.4.9 · silverstripe/silverstripe-userforms · GitHub x_refsource_MISC
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🔗 Release 7.1.1 · silverstripe/silverstripe-userforms · GitHub x_refsource_MISC
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🔗 Release 7.0.7 · silverstripe/silverstripe-userforms · GitHub x_refsource_MISC
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V. Comments for CVE-2026-54721
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