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CVE-2026-120640— CGI versions before 5.00 for Perl allow the POSTDATA, PUTDATA, PATCHDATA and XForms:Model parameters to be set from the query string or form fields

Quick assessment

Affected
CVE-2026-120640
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.

Perl 的 CGI 模块在 5.00 版本之前存在安全漏洞，允许通过查询字符串或表单字段设置 POSTDATA、PUTDATA、PATCHDATA 以及 XForms:Model 参数。 CGI 模块通常将非表单请求体存储在 POSTDATA、PUTDATA 或 PATCHDATA 变量中，而将 XForms 请求体存储在 XForms:Model 变量中。然而，该模块同时也接受这些参数名称来自查询字符串、表单字段或多部分（multipart）数据。因此，应用程序无法区分客户端发送的值与真实的请求体内容。 攻击者

AI Predicted 8.1 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

I. Basic Information for CVE-2026-120640

Vulnerability Information
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Vulnerability Title
CGI versions before 5.00 for Perl allow the POSTDATA, PUTDATA, PATCHDATA and XForms:Model parameters to be set from the query string or form fields
Source: CVE Program / CVE List V5
Vulnerability Description
CGI versions before 5.00 for Perl allow the POSTDATA, PUTDATA, PATCHDATA and XForms:Model parameters to be set from the query string or form fields. CGI stores a non-form request body under POSTDATA, PUTDATA or PATCHDATA, and an XForms body under XForms:Model, but also accepts these names from the query string, a form field or a multipart part, so an application cannot tell a client-sent value from the real body. A cross-site HTML form can post POSTDATA={"admin":true} to an endpoint that reads JSON from param('POSTDATA'), a request forgery that needs no CORS preflight.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0 ~ 5.00 -

II. Public POCs for CVE-2026-120640

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-120640

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Other References for CVE-2026-120640 (3)

IV. Related Vulnerabilities

Same weakness: CWE-352