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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- nextcloud/security-advisoriesv5Range: >= 1.15.0-beta.1, < 1.15.1
Patches
Vulnerability mechanics
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
0No linked articles in our index yet.