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Improper Restriction of XML External Entity Reference

CVE-2025-1781

High
8.4/10

Summary

There is an XML External Entity (XXE) vulnerability in W3CSS Validator that allows an attacker to use specially-crafted XML objects to coerce Server-Side Request Forgery (SSRF). This could be exploited to read arbitrary local files if an attacker has access to exception messages. The issue was patched with commit dfc4ca1.

  • LOW
  • NETWORK
  • NONE
  • UNCHANGED
  • NONE
  • LOW
  • HIGH
  • NONE

CWE-611 - Improper Restriction of XML External Entity Reference

Listed 4th in the 'OWASP Top Ten', XML External Entities (XXE) vulnerability allows attackers to provide an XML input that contains an external entity. When the XML is parsed, it can cause data extraction and manipulation, execution of commands, denial-of-service attacks, and server-side request forgery.

References

Advisory Timeline

  • Published