CVE-2023-48302: Nextcloud Server

Medium severity, CVSS 5.4. 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 25.0.0 and prior to versions 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Server and Nextcloud Enterprise Server, when a user is tricked into copy pasting HTML code without markup (Ctrl+Shift+V) the markup will actually render. Nextcloud Server and Nextcloud Enterprise Server versions 25.0.13, 26.0.8, and 27.1.3 contain a fix for this issue. As a workaround, disable app text.

Affected products

• Nextcloud Nextcloud Server: from 25.0.0, before 25.0.13 (fixed in 25.0.13); from 26.0.0, before 26.0.8 (fixed in 26.0.8); from 27.0.0, before 27.1.3 (fixed in 27.1.3)

Published 2023-11-21. Last modified 2026-06-17.