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CVE-2026-63228 is an unrestricted file upload vulnerability affecting Koollab LMS 5.3.2. The flaw exists in the feedback mail registration endpoint, where the application fails to adequately validate uploaded image content. An authenticated attacker can submit malicious content disguised as an image file, allowing untrusted files to be stored by the application. Although described as an image upload issue, the core weakness is insufficient enforcement of file type restrictions on user-supplied upload content, creating an avenue for server-side abuse and follow-on attacks depending on how the uploaded content is stored, processed, or later accessed.
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Cross-references every affected SKU, including bundled OEM variants.
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