CVE-2026-88920
Received Received - Intake

Authentication Bypass in Apache WSS4J via SAML Assertion Forgery

Publication date: 2026-09-30

Last updated on: 2026-09-30

Assigner: Apache Software Foundation

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.

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Meta Information

Published
2026-09-30
Last Modified
2026-09-30
Generated
2026-09-30
AI Q&A
2026-09-30
EPSS Evaluated
N/A
NVD
CVE-2026-88920
EUVD
EUVD-2026-89793

Affected Vendors & Products

Showing 6 associated CPEs
Vendor Product Version / Range
apache wss4j 4.0.2
apache wss4j 3.0.6
apache wss4j 2.4.4
apache wss4j to 4.0.2 (exc)
apache wss4j to 3.0.6 (exc)
apache wss4j to 2.4.4 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

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Executive Summary

This vulnerability is an authentication bypass in Apache WSS4J's DOM security processor. It allows unauthenticated remote attackers to forge authenticated SOAP messages by exploiting a crafted unsigned SAML sender-vouches assertion containing a controlled key.

Impact Analysis

Attackers could impersonate legitimate users or services in SOAP-based communications, potentially gaining unauthorized access to sensitive data or performing actions on behalf of authenticated parties.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating confidentiality requirements in GDPR and HIPAA. Organizations may face compliance failures and legal consequences if exploited.

Mitigation Strategies

Upgrade Apache WSS4J to version 4.0.2 or 3.0.6 or 2.4.4 to fix the authentication bypass vulnerability in the DOM security processor.

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