CVE-2026-88920

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.

Score

CVSS 3.1 9.8 Critical

Status

Analyzed - security@apache.org

Published

2026-09-30

Last modified

2026-10-02

Weaknesses

CWE-287

Affected products

• Wss4j (Apache)
• Apache Wss4j (Apache Software Foundation)

References

• https://lists.apache.org/thread.html/grt43m3bgbzz0mk0cnho3rcybb1j01z9
• http://www.openwall.com/lists/oss-security/2026/09/30/10