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

high Affects yiisoft/yii2. Feed 2026.10.29.4, updated 2026-10-29; published 2026-05-11; advisory modified 2026-09-10.

Yii 2: Local file inclusion via view parameter name collision

Package: yiisoft/yii2 Composer
Affected versions: <2.0.55
Fixed in: 2.0.55
Severity: high CVSS 7.4
Exploitation: not on CISA KEV · EPSS 0% (39.4th percentile)
Published: 2026-05-11
Source: osv.dev

References

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden deps composer.lock

# or, without Composer
pipx install phpwarden   &&   phpwarden deps composer.lock

Or keep it checked automatically: GitHub Action · pre-commit hook · GitLab CI · Laravel artisan command

Install docs How findings are ranked

Related advisories

CVE-2024-58136 KEV critical yiisoft/yii2 Mishandles the Attaching of Behavior Defined by a `__class` Array Key same package: yiisoft/yii2
CVE-2024-4990 high Unsafe Reflection in base Component class in yiisoft/yii2 same package: yiisoft/yii2
CVE-2020-15148 high Unsafe deserialization in Yii 2 same package: yiisoft/yii2
CVE-2018-6010 high Yii Framework reflected Cross-site Scripting same package: yiisoft/yii2
CVE-2015-3397 medium Yii Framework Cross-site Scripting Vulnerability same package: yiisoft/yii2
CVE-2018-7269 critical Yii SQL injection vulnerability same package: yiisoft/yii2