All vulnerabilities
CVE-2026-87830

Apache WSS4J: Streaming WS-SecurityPolicy validation may skip element-protection checks.

Apache Software Foundation Apache WSS4J
Open in ThreatlineRecord JSON
CVSS
9.1Critical
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.21%Chance of exploitation activity in the next 30 days, higher than 11% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in4.0.2Also 3.0.6, 2.4.4CVE List
Published30 Sep 2026Updated 30 Sep 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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.

Text from CVE List

Affected versions 3

  • Apache WSS4Jaffected: 4.0.0 before 4.0.2CVE List
  • Apache WSS4Jaffected: 3.0.0 before 3.0.6CVE List
  • Apache WSS4Jaffected: all versions before 2.4.4CVE List

References 1