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Nextcloud: SMIL values and by attributes bypass remote image blocking via unvalidated resource-loading animations, enabling email tracking without consent

🗓️ 07 Mar 2026 11:33:03Reported by nullcathedralType 
hackerone
 hackerone
🔗 hackerone.com👁 3 Views

Roundcube HTML sanitizer flaw lets SMIL attributes bypass remote image blocking, enabling email tracking without user consent.

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