CVE-2026-87830
Last modified
CVE-2026-87830 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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.. EPSS estimates a 0.18% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Apache | Wss4j | < 2.4.4 |
| Apache | Wss4j | >= 3.0.0, < 3.0.6 |
| Apache | Wss4j | >= 4.0.0, < 4.0.2 |
References
- https://www.openwall.com/lists/oss-security/2026/09/30/9Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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