CVE-2026-88920: Apache WSS4J

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

An authentication bypass in the DOM security processor in Apache WSS4J allows unauthenticated remote attackers to forge authenticated SOAP messages via a crafted unsigned SAML sender-vouches assertion containing an attacker-controlled key. Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.

Affected products

• Apache WSS4J: before 2.4.4 (fixed in 2.4.4); from 3.0.0, before 3.0.6 (fixed in 3.0.6); from 4.0.0, before 4.0.2 (fixed in 4.0.2)

Published 2026-09-30. Last modified 2026-10-02.