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Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.
REDAXO is a PHP-based content management system. Prior to 5.21.2, the mediaIsInUse() handler in redaxo/src/addons/media_manager/lib/media_manager.php inserts a Media Manager type name into raw backend warning HTML without escaping it when invoked through MEDIA_IS_IN_USE. An administrator with Media Manager access can store HTML in a type name, and the payload executes in another administrator's browser when that administrator tries to delete media referenced by the type's effects, enabling session theft or unauthorized backend actions. This issue is fixed in version 5.21.2.
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{
"vendor": "redaxo",
"product": "core",
"versions": [
{
"version": "< 5.21.2",
"status": "affected"
}
]
}Original source record · Cite this exact observation · Complete original publisher JSON