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Yii 2: Local file inclusion via view parameter name collision

High severity GitHub Reviewed Published May 9, 2026 in yiisoft/yii2 • Updated Jun 8, 2026

Package

composer yiisoft/yii2 (Composer)

Affected versions

< 2.0.55

Patched versions

2.0.55

Description

The core view rendering method View::renderPhpFile() calls extract($_params_, EXTR_OVERWRITE) before the require statement that includes the view file. A caller-controlled parameter named _file_ in the $params array overwrites the internal local variable that specifies which file is included — enabling a Local File Inclusion primitive.

Impact

  • Local File Inclusion (arbitrary file read via non-PHP files)
  • Potential RCE if attacker can write PHP files via a separate primitive
  • Information disclosure

Patches

2.0.55

Workarounds

No.

References

@samdark samdark published to yiisoft/yii2 May 9, 2026
Published to the GitHub Advisory Database May 11, 2026
Reviewed May 11, 2026
Published by the National Vulnerability Database May 20, 2026
Last updated Jun 8, 2026

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(36th percentile)

Weaknesses

Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Learn more on MITRE.

Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion')

The PHP application receives input from an upstream component, but it does not restrict or incorrectly restricts the input before its usage in require, include, or similar functions. Learn more on MITRE.

CVE ID

CVE-2026-39850

GHSA ID

GHSA-5vpg-rj7q-qpw2

Source code

Credits

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