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CVE-2026-52889— Formie: Server-Side Template Injection in Formie Hidden field defaults

Quick assessment

Affected
verbb formie
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Verbb Formie是Verbb公司开源的一款CMS表单构建组件插件。 Verbb Formie 3.1.27之前版本存在代码注入漏洞，该漏洞源于将请求衍生的隐藏字段默认值（如HTTP User Agent、Referer URL、当前URL、查询参数和Cookie值）传递给Twig渲染层，可能导致服务器端模板评估，进而泄露敏感信息、修改应用状态或执行远程代码。

CVSS 9.8 · Critical EPSS 1.27% · P70

Affected Version Matrix 1

VendorProduct Version RangeStatus
verbb formie < 3.1.27 affected
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I. Basic Information for CVE-2026-52889

Vulnerability Information
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Vulnerability Title
Formie: Server-Side Template Injection in Formie Hidden field defaults
Source: CVE Program / CVE List V5
Vulnerability Description
Formie is a Craft CMS plugin for creating forms. Prior to 3.1.27, Formie can pass request-derived Hidden field defaults such as HTTP User Agent, Referer URL, Current URL, Current URL without Query String, Query Parameter, and Cookie Value to Craft's Twig rendering layer during front-end form rendering. An unauthenticated attacker can place Twig syntax in one of these request-controlled inputs when a public form contains an affected Hidden field. Hidden::getFrontEndInputOptions() then assigns the value to defaultValue and calls renderString, causing server-side template evaluation rather than treating the request data as a plain string. Depending on the Craft site configuration and available Twig capabilities, exploitation can disclose sensitive information, modify application state, or achieve remote code execution. This issue is fixed in version 3.1.27.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1336
Source: CVE Program / CVE List V5
Vulnerability Title
Verbb Formie 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Verbb Formie是Verbb公司开源的一款CMS表单构建组件插件。 Verbb Formie 3.1.27之前版本存在代码注入漏洞，该漏洞源于将请求衍生的隐藏字段默认值（如HTTP User Agent、Referer URL、当前URL、查询参数和Cookie值）传递给Twig渲染层，可能导致服务器端模板评估，进而泄露敏感信息、修改应用状态或执行远程代码。
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
verbb formie < 3.1.27 -

II. Public POCs for CVE-2026-52889

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 16072 chars
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III. Intelligence Information for CVE-2026-52889

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Patches & Fixes for CVE-2026-52889 (1)

Vendor Advisories for CVE-2026-52889 (1)

Vendor Pages for CVE-2026-52889 (1)

IV. Related Vulnerabilities

Same product: formie
Same vendor: verbb
Same weakness: CWE-1336

V. Comments for CVE-2026-52889

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