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GHSA-m7gw-rffq-rxjmlow0.0

Winter CMS has Stored Cross-site Scripting (XSS) in Asset Manager

Impact

Affected versions of Winter CMS allow users with access to the CMS Asset Manager were able to upload SVGs without automatic sanitization.

Source excerpt · OSV

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

winter/wn-cms-module Packagist
Affected rangeRecorded fix
Earlier releases before 1.2.10Ecosystem versions1.2.10

Version evidence: OSV · GHSA-m7gw-rffq-rxjm

View original version evidence (23 explicit versions)

Original source description

Impact

Affected versions of Winter CMS allow users with access to the CMS Asset Manager were able to upload SVGs without automatic sanitization.

To actively exploit this security issue, an attacker would need access to the Backend with a user account with the following permission: cms.manage_assets

The Winter CMS maintainers strongly recommend that the cms.manage_assets permission only be reserved to trusted administrators and developers in general.

Patches

Sanitization of SVG assets is now applied automatically when uploading through the CMS Asset Manager.

This security issue has been fixed as of https://github.com/wintercms/winter/commit/8a7f74b004fcd19721764fc63af0cdb339d9fb65.

Workarounds

If users cannot upgrade, they may apply commit https://github.com/wintercms/winter/commit/8a7f74b004fcd19721764fc63af0cdb339d9fb65 to their Winter CMS installation manually to resolve this issue.

References