CVE-2026-88920 Apache WSS4J - Authentication Bypass

Apache WSS4J < 4.0.2, < 3.0.6, and < 2.4.4 contain an authentication bypass caused by crafted unsigned SAML sender-vouches assertion with attacker-controlled key in DOM security processor, letting unauthenticated remote attackers forge authenticated SOAP messages.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.57% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
30 September 2026
Updated
15 October 2026
Weakness
CWE-287

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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