Cross-site scripting (XSS) vulnerability in a reachable files_pdfviewer example directory...

Vulnerability Description

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.

References

• https://nextcloud.com
• https://www.redteam-pentesting.de/en/advisories/rt-sa-2025-003/
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-24wp-p865-7j4r