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How the mentioned CVE works:
CVE-2025-63830 is a Stored Cross-Site Scripting (XSS) vulnerability in CKFinder 1.4.3. The flaw exists within the file upload functionality, which fails to properly sanitize user-supplied input. An attacker can exploit this by uploading a malicious Scalable Vector Graphics (SVG) file containing embedded JavaScript payloads. When an authenticated user, such as an administrator, later views or manages the uploaded files in the CKFinder interface, the malicious script within the SVG file is executed in the victim’s browser. This allows the attacker to perform actions with the victim’s privileges, potentially leading to session hijacking, account takeover, or defacement of the application, as the SVG’s active content is rendered without adequate validation or encoding.
Platform: CKFinder
Version: 1.4.3
Vulnerability: Stored XSS
Severity: Critical
date: 2025-11-14
Prediction: Patch by 2025-12-15
What Undercode Say:
curl -F '[email protected]' http://target/ckfinder/upload`
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