CVE-2025-59788: Nextcloud Server

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

Cross-site scripting (XSS) vulnerability in a reachable files_pdfviewer example directory in Nextcloud with versions before 22.2.10.33, 23.0.12.29, 24.0.12.28, 25.0.13.23, 26.0.13.20, 27.1.11.20, 28.0.14.11, 29.0.16.8, 30.0.17, 31.0.10, and 32.0.1 allows attackers to execute arbitrary JavaScript in the context of a user's browser via a crafted PDF file to viewer.html. This issue is related to CVE-2024-4367, but the root cause of this Nextcloud issue is that the product exposes executable example code on a same-origin basis.

Affected products

• Nextcloud Nextcloud Server: from 30.0.0, before 30.0.17 (fixed in 30.0.17); from 31.0.0, before 31.0.10 (fixed in 31.0.10); from 32.0.0, before 32.0.1 (fixed in 32.0.1); from 22.0.0, before 22.2.10.33 (fixed in 22.2.10.33); from 23.0.0, before 23.0.12.29 (fixed in 23.0.12.29); from 24.0.0, before 24.0.12.28 (fixed in 24.0.12.28); …

Published 2025-12-04. Last modified 2026-06-17.