CVE-2026-39850: CWE-20: Improper Input Validation in yiisoft yii2
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 $params array overwrites the internal local variable specifying which file to include, potentially enabling RCE if an attacker can write PHP files through a separate primitive, as well as information disclosure. This issue has been fixed in version 2.0.55.
AI Analysis
Technical Summary
CVE-2026-39850 is an improper input validation vulnerability in the Yii 2 PHP framework (versions prior to 2.0.55). The flaw exists in the View::renderPhpFile() method, where extract($_params_, EXTR_OVERWRITE) is called before requiring the view file. This allows an attacker to control the '_file_' variable via the $params array, causing the application to include arbitrary local files. This can lead to local file inclusion and, if combined with a separate file write vulnerability, remote code execution. The vulnerability is addressed in Yii 2 version 2.0.55.
Potential Impact
Successful exploitation can lead to local file inclusion, which may disclose sensitive information. If an attacker can write PHP files through another vulnerability, this flaw could enable remote code execution. The CVSS score of 7.4 reflects high impact on confidentiality and integrity, with no impact on availability.
Mitigation Recommendations
This vulnerability is fixed in Yii 2 version 2.0.55. Users should upgrade to version 2.0.55 or later to remediate the issue. Since no official patch link or vendor advisory was provided, verify the upgrade from the official Yii framework sources. There is no indication that this is a cloud service; thus, remediation depends on user action to upgrade.
CVE-2026-39850: CWE-20: Improper Input Validation in yiisoft yii2
Description
Yii 2 is a PHP application framework. Versions 2.0.54 and prior contain flawed logic in the core view rendering method View::renderPhpFile() that leads to Local File Inclusion. The function calls extract($_params_, EXTR_OVERWRITE) before the require statement that loads the view file. As a result, a caller-controlled _file_ key in the $params array overwrites the internal local variable specifying which file to include, potentially enabling RCE if an attacker can write PHP files through a separate primitive, as well as information disclosure. This issue has been fixed in version 2.0.55.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-39850 is an improper input validation vulnerability in the Yii 2 PHP framework (versions prior to 2.0.55). The flaw exists in the View::renderPhpFile() method, where extract($_params_, EXTR_OVERWRITE) is called before requiring the view file. This allows an attacker to control the '_file_' variable via the $params array, causing the application to include arbitrary local files. This can lead to local file inclusion and, if combined with a separate file write vulnerability, remote code execution. The vulnerability is addressed in Yii 2 version 2.0.55.
Potential Impact
Successful exploitation can lead to local file inclusion, which may disclose sensitive information. If an attacker can write PHP files through another vulnerability, this flaw could enable remote code execution. The CVSS score of 7.4 reflects high impact on confidentiality and integrity, with no impact on availability.
Mitigation Recommendations
This vulnerability is fixed in Yii 2 version 2.0.55. Users should upgrade to version 2.0.55 or later to remediate the issue. Since no official patch link or vendor advisory was provided, verify the upgrade from the official Yii framework sources. There is no indication that this is a cloud service; thus, remediation depends on user action to upgrade.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-07T19:13:20.378Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a0e173eba1db47362a37eac
Added to database: 5/20/2026, 8:19:10 PM
Last enriched: 5/20/2026, 8:34:03 PM
Last updated: 5/21/2026, 3:21:28 PM
Views: 12
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