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The CVE-2025-66512 vulnerability in Nextcloud Server stems from inadequate sanitization of user-uploaded SVG files. When these SVG files are viewed outside the Nextcloud web page context, embedded malicious scripts can execute, circumventing the Content Security Policy (CSP). This bypass occurs because CSP directives are not properly applied or enforced when the SVG is rendered directly in the browser or via external viewers. Attackers craft SVG files with JavaScript code, such as within `
how Exploit:
Attacker uploads malicious SVG.
User views SVG externally.
CSP bypassed, script executes.
Protection from this CVE
Update to patched versions.
Implement strict CSP headers.
Sanitize SVG uploads thoroughly.
Impact:
Cross-site scripting attacks.
Data theft potential.
Session hijacking risk.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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