[ CVE-2026-88920 · Published 30 Sep 2026 ]

Vulnerability in Apache Software Foundation Apache WSS4J

CVSS 9.8 EPSS <1%No fix listed yet

[ Why it matters ]Priority signals

Critical severity: CVSS 9.8

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

lists.apache.org/thread.html/grt43m3bgbzz0mk0cnho3rcybb1j01z9Mailing ListVendor Advisory
www.openwall.com/lists/oss-security/2026/09/30/10Mailing ListThird Party Advisory