CVE-2025-63917: Cnblogs Pdfpatcher

High severity, CVSS 7.1. EPSS: 0.4% chance of exploitation in the next 30 days.

PDFPatcher thru 1.1.3.4663 executable's XML bookmark import functionality does not restrict XML external entity (XXE) references. The application uses .NET's XmlDocument class without disabling external entity resolution, enabling attackers to: Read arbitrary files from the victim's filesystem, exfiltrate sensitive data via out-of-band (OOB) HTTP requests, perform SSRF attacks against internal network resources, or cause a denial of service via entity expansion attacks.

Affected products

• Cnblogs Pdfpatcher: up to and including 1.1.3.4663

Published 2025-11-17. Last modified 2026-06-17.