Unrated severityNVD Advisory· Published Dec 5, 2025· Updated Dec 8, 2025
Nextcloud Deck app allows to spoof file extensions by using RTLO characters
CVE-2025-66548
Description
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 than what is displayed. This vulnerability is fixed in 1.12.7, 1.14.4, and 1.15.1.
Affected products
2- nextcloud/security-advisoriesv5Range: >= 1.15.0-beta.1, < 1.15.1
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
4- github.com/nextcloud/deck/commit/afa95d3c507465b9d31af7c88c69b76711ef185amitrex_refsource_MISC
- github.com/nextcloud/deck/pull/6671mitrex_refsource_MISC
- github.com/nextcloud/security-advisories/security/advisories/GHSA-xjvq-xvr7-xpg6mitrex_refsource_CONFIRM
- hackerone.com/reports/2326618mitrex_refsource_MISC
News mentions
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