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

8Baixo

Decisão SSVC (CISA)

Track

Sem sinal de exploração → monitorar

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

Ciclo de vida

05 dez 2025Publicada no NVD

Recomendação: Monitorar — sem sinal de exploração no momento.

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

Produtos afetados

nextcloud · security-advisories

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Referências

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