Advisory severityCritical9.1Apache Software Foundation

Critical [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

This critical-severity Apache Software Foundation advisory covers CVE-2026-87830; related products: Apache WSS4J.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-87830 Source published Sep 30, 2026Source updated Sep 30, 2026

VulniPulse record published Sep 30, 2026Record updated Sep 30, 2026

CVE-2026-87830

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Summary

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 product named by the advisory: Apache WSS4J.

Affected versions

Apache WSS4J 4.0.0 before 4.0.2
Apache WSS4J 3.0.0 before 3.0.6
Apache WSS4J before 2.4.4

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Fixed versions

4.0.2
3.0.6
2.4.4

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Apache Software Foundation
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-87830 instead of the raw feed document.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-87830NVD CVE.org MITRE

Official resources

ASF Security — reporting & CVE process
Official documentation
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Apache project downloads (fixed releases)
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