XXE in Cnblogs Pdfpatcher
CVE-2025-63917
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.
Vulnerability class: XXE (XML External Entity)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:L.
EPSS exploit prediction
EPSS: 0.004 (31.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- www.cnblogs.com/pdfpatcher (Product)
- github.com/wmjordan/PDFPatcher (Product)
- github.com/cydtseng/Vulnerability-Research/blob/main/pdfpatcher/XXE-Importers.md (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-63917?
- CVE-2025-63917 is a high-severity vulnerability in Cnblogs Pdfpatcher, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 7.1/10. Published 2025-11-17.
- How severe is CVE-2025-63917?
- High severity. CVSS v3 base score is 7.1 out of 10.