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CVE-2026-39850— Yii 2: Local file inclusion via view parameter name collision

Quick assessment

Affected
yiisoft yii2
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.

Yii是YII团队的开发的一套基于组件、用于开发大型Web应用的高性能PHP框架。 Yii 2 2.0.54及之前版本存在输入验证错误漏洞，该漏洞源于核心视图渲染方法View::renderPhpFile()中逻辑缺陷导致本地文件包含，可能通过参数覆盖内部变量导致远程代码执行和信息泄露。

CVSS 7.4 · High EPSS 0.50% · P40

Affected Version Matrix 1

VendorProduct Version RangeStatus
yiisoft yii2 < 2.0.55 affected
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I. Basic Information for CVE-2026-39850

Vulnerability Information
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Vulnerability Title
Yii 2: Local file inclusion via view parameter name collision
Source: CVE Program / CVE List V5
Vulnerability Description
Yii 2 is a PHP application framework. Versions 2.0.54 and prior contain flawed logic in the core view rendering method View::renderPhpFile() that leads to Local File Inclusion. The function calls extract($_params_, EXTR_OVERWRITE) before the require statement that loads the view file. As a result, a caller-controlled _file_ key in the $params array overwrites the internal local variable specifying which file to include, potentially enabling RCE if an attacker can write PHP files through a separate primitive, as well as information disclosure. This issue has been fixed in version 2.0.55.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Yii 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Yii是YII团队的开发的一套基于组件、用于开发大型Web应用的高性能PHP框架。 Yii 2 2.0.54及之前版本存在输入验证错误漏洞，该漏洞源于核心视图渲染方法View::renderPhpFile()中逻辑缺陷导致本地文件包含，可能通过参数覆盖内部变量导致远程代码执行和信息泄露。
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
yiisoft yii2 < 2.0.55 -

II. Public POCs for CVE-2026-39850

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9653 chars
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III. Intelligence Information for CVE-2026-39850

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Patches & Fixes for CVE-2026-39850 (1)

Vendor Advisories for CVE-2026-39850 (1)

IV. Related Vulnerabilities

Same product: yii2
Same vendor: yiisoft
Same weakness: CWE-20

V. Comments for CVE-2026-39850

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