CVE-2025-66548

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

CVSS 3.3 LOWEPSS 0.1%CWE-116

Vexday Risk Score

8Bajo

Decisión SSVC (CISA)

Track

Sin señal de explotación → monitorear

CVSS 3.3EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch —

Ciclo de vida

05 dic 2025Publicada en NVD

Recomendación: Monitorear — sin señal de explotación por ahora.

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Productos afectados

nextcloud · security-advisories

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Referencias

https://github.com/nextcloud/deck/commit/afa95d3c507465b9d31af7c88c69b76711ef185a https://github.com/nextcloud/deck/pull/6671 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xjvq-xvr7-xpg6 https://hackerone.com/reports/2326618