CVE-2025-66548

Nextcloud Deck app allows to spoof file extensions by using RTLO characters

Published Dec 5, 2025 CVSS 3.1 · 3.3 Low EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*
Type Values Removed Values Added
First Time appeared Nextcloud
Nextcloud deck
Vendors & Products Nextcloud
Nextcloud deck
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Nextcloud Deck app allows to spoof file extensions by using RTLO characters
Weaknesses CWE-116
References
Metrics cvssV3_1

{'score': 3.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Dec 8, 2025, 8:12 PM
Reserved
Dec 4, 2025, 3:52 PM
Status
Analyzed
Published
Dec 5, 2025, 6:15 PM
Modified
Oct 15, 2026, 9:10 PM