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Status published
Low
CVE-2025-66548
Nextcloud Deck app allows to spoof file extensions by using RTLO characters
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
References
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Affected Vendor
nextcloud
View all reports →Affected Software
security-advisories
Vulnerable Versions:
>= 1.15.0-beta.1, < 1.15.1, >= 1.14.0-beta.1, < 1.14.4, < 1.12.7
Timeline
Official Publish:
December 5th, 2025
Last Modified:
December 8th, 2025
Added to House:
July 22nd, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N