XSS in Nextcloud
CVE-2025-59788
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.
EPSS: 0.003 (17.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
Affected products
- Nextcloud — versions 0, 23, 24
- Nextcloud Nextcloud_server
Weakness classification (CWE)
References
- cve@mitre.org (Product)
- cve@mitre.org (Exploit, Third Party Advisory)
- cve@mitre.org (Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-59788?
- CVE-2025-59788 is a medium-severity vulnerability in Nextcloud, classified under CWE-749. CVSS score: 6.4/10. Published 2025-12-04.
- How severe is CVE-2025-59788?
- Medium severity. CVSS v3 base score is 6.4 out of 10.