CVE-2026-22254: Winter CMS has Stored Cross-site Scripting (XSS) in Asset Manager

February 4, 2026

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.

References

github.com/advisories/GHSA-m7gw-rffq-rxjm
github.com/wintercms/winter
github.com/wintercms/winter/commit/8a7f74b004fcd19721764fc63af0cdb339d9fb65
github.com/wintercms/winter/security/advisories/GHSA-m7gw-rffq-rxjm
nvd.nist.gov/vuln/detail/CVE-2026-22254

Code Behaviors & Features

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