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CVE-2025-66548

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Date: December 5, 2025

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.

Severity Score

Related Resources (6)

https://hackerone.com/reports/2326618
https://nvd.nist.gov/vuln/detail/CVE-2025-66548
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xjvq-xvr7-xpg6
https://github.com/nextcloud/deck/commit/afa95d3c507465b9d31af7c88c69b76711ef185a
https://github.com/nextcloud/deck/pull/6671
https://www.mend.io/vulnerability-database/CVE-2025-66548

Severity Score

Weakness Type (CWE)

Improper Encoding or Escaping of Output

CWE-116

Top Fix

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Upgrade Version

Upgrade to version https://github.com/nextcloud/deck.git - v1.15.1;https://github.com/nextcloud/deck.git - v1.12.7;https://github.com/nextcloud/deck.git - v1.13.4;https://github.com/nextcloud/deck.git - v1.14.4

Learn More

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

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