by Kastro
Paper/Archive/CVE-2026-88920

CVE-2026-88920

Apache Software Foundation Apache WSS4J — Apache WSS4J: SAML Sender-Vouches Authentication Bypass

EPSS 0.6%CVSS 9.8
critical.is priorityof 100
39
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 47.8.478 × 209.6No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Apache WSS4J4.0.0 – < 4.0.24.0.2CNA
Apache WSS4J3.0.0 – < 3.0.63.0.6CNA
Apache WSS4J< 2.4.42.4.4CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisorylists.apache.org/thread.html/grt43m3bgbzz0mk0cnho3rcybb1j01z9refopenwall.com/lists/oss-security/2026/09/30/10