CVE-2026-87830

In the StAX streaming WS-SecurityPolicy validator, certain relative or unsupported XPath expressions can be converted into paths that never match the actual XML element path. A remote SOAP peer may therefore send a required element without the expected signature or encryption. Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.

  • Published Sep 30, 2026
  • CVSS 9.1 critical
  • 0.2% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-87830 at the National Vulnerability Database