CVE-2026-88920

EUVD-2026-89793
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 48.41%
Affected Products (NVD)
VendorProductVersion
apachewss4j
𝑥
< 2.4.4
apachewss4j
3.0.0 ≤
𝑥
< 3.0.6
apachewss4j
4.0.0 ≤
𝑥
< 4.0.2
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
wss4j
bookworm
ignored
forky
vulnerable
sid
vulnerable
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
wss4j
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
xenial
needs-triage
Common Weakness Enumeration
References
https://lists.apache.org/thread.html/grt43m3bgbzz0mk0cnho3rcybb1j01z9
http://www.openwall.com/lists/oss-security/2026/09/30/10