CVE-2023-39961: Nextcloud Server

Medium severity, CVSS 4.3. EPSS: 0.6% chance of exploitation in the next 30 days.

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 24.0.4 and prior to versions 25.0.9, 26.0.4, and 27.0.1, when a folder with images or an image was shared without download permissions, the user could add the image inline into a text file and download it. Nextcloud Server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1 contain a patch for this issue. No known workarounds are available.

Affected products

• Nextcloud Nextcloud Server: from 25.0.0, before 25.0.9 (fixed in 25.0.9); from 26.0.0, before 26.0.4 (fixed in 26.0.4); version 27.0.0 only

Published 2023-08-10. Last modified 2026-06-17.