Paper/Archive/CVE-2026-87830

CVE-2026-87830

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

EPSS 0.2%CVSS 9.1

critical.is priorityof 100

CVSS 9.1 (ADP)9.1 / 10 × 3027.3 Not in CISA KEV+300.0 EPSS percentile 12.2.122 × 202.4 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

Apache WSS4J4.0.0 – < 4.0.24.0.2CNA

Apache WSS4J3.0.0 – < 3.0.63.0.6CNA

Apache WSS4J< 2.4.42.4.4CNA

Scores by source

CISA ADP9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisorylists.apache.org/thread.html/lwlozb1x20d16f9dnyvoygc9rrhzq2vn refopenwall.com/lists/oss-security/2026/09/30/9