CVE-2026-88920

Apache WSS4J: SAML Sender-Vouches Authentication Bypass

State: Published
Severity: 9.8 Critical
Published: Sep 30, 2026
Updated: Sep 30, 2026
Reserved: Sep 10, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-287 Improper Authentication

Affected Products

Product	Versions
Apache WSS4JApache Software Foundation	4.0.0 to before 4.0.2Affected 3.0.0 to before 3.0.6Affected before 2.4.4Affected

References

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