CVE-2025-66548 Nextcloud Deck app allows to spoof file extensions by using RTLO characters

Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.12.7, 1.14.4, and 1.15.1, file extension can be spoofed by using RTLO characters, tricking users into download files with a different extension th...

CVE-2025-66548

The Nextcloud Deck app allows spoofing file extensions by using RTLO characters, causing a mismatch between the displayed and actual extension. Affected versions are prior to 1.12.7, 1.14.4, and 1.15.1; fixes are in 1.12.7, 1.14.4, and 1.15.1. Exploitation details are not provided in the supplied...

security flaw

Firefox before 1.0.1 and Mozilla before 1.7.6 allows remote malicious web sites to spoof the extensions of files to download via the Content-Disposition header, which could be used to trick users into downloading dangerous content...