CVE-2026-87830 StAX WS-SecurityPolicy Validator - Broken Access Control

StAX streaming WS-SecurityPolicy validator contains a broken access control vulnerability caused by incorrect handling of relative or unsupported XPath expressions, letting remote SOAP peers bypass signature or encryption requirements, exploit requires sending crafted SOAP messages.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.21% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
30 September 2026
Updated
15 October 2026
Weakness
CWE-917

Vendor fix

Upgrade to versions 4.0.2, 3.0.6, or 2.4.4 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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