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MEDIUM severity

Yii Cross-site Scripting Framework vulnerabilityGHSA-4c64-w8fg-xcq2

MEDIUMFix: yiisoft/yii2#14492

GHSA-4c64-w8fg-xcq2 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in yiisoft/yii2-dev. A fix is available for yiisoft/yii2-dev — see the affected versions and patch details below.

Also known asCVE-2017-11516
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs58th percentile — riskier than 58% of all scored CVEsHighest risk
0.00%0.44%0.89%1.33%0.2%0.8%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
🐘yiisoft/yii2-dev🐘yiisoft/yii2

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

An XSS vulnerability exists in framework/views/errorHandler/exception.php in Yii Framework 2.0.12 affecting the exception screen when debug mode is enabled, because $exception->errorInfo is mishandled.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistyiisoft/yii2-dev≥ 2.0.12&&< 2.0.132.0.13composer require yiisoft/yii2-dev:^2.0.13
🐘Packagistyiisoft/yii2≥ 2.0.12&&< 2.0.132.0.13composer require yiisoft/yii2:^2.0.13

Affected Products

1 product · 1 configurations
Application
yiiyiiframework
1 version
2.0.12

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for yiisoft/yii2-dev, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update yiisoft/yii2-dev to 2.0.13 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-4c64-w8fg-xcq2 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

An XSS vulnerability exists in framework/views/errorHandler/exception.php in Yii Framework 2.0.12 affecting the exception screen when debug mode is enabled, because $exception->errorInfo is mishandled.
O3 Security · Impact-Aware SCA

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Yii Cross-site Scripting Framework vulnerability