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.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/nextcloud/deck/commit/afa95d3c507465b9d31af7c88c69b76711ef185a Patch
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xjvq-xvr7-xpg6 Patch, Vendor Advisory
- https://hackerone.com/reports/2326618 Permissions Required, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.5 · nextcloudNVD modified 2026-10-15 21:10
Affected (CPE criteria) 1
cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*
References 4
- https://github.com/nextcloud/deck/commit/afa95d3c507465b9d31af7c88c69b76711ef185a Patch
- https://github.com/nextcloud/deck/pull/6671 Issue Tracking
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xjvq-xvr7-xpg6 Patch, Vendor Advisory
- https://hackerone.com/reports/2326618 Permissions Required, Vendor Advisory