CVE-2026-88920

Apache WSS4J: SAML Sender-Vouches Authentication Bypass

Published Sep 30, 2026 CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:a:apache:wss4j:*:*:*:*:*:*:*:*
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Apache
Apache wss4j
Vendors & Products Apache
Apache wss4j
Type Values Removed Values Added
Weaknesses CWE-287
Type Values Removed Values Added
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.
Title Apache WSS4J: SAML Sender-Vouches Authentication Bypass
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
apache
Published
Updated
Sep 30, 2026, 7:48 PM
Reserved
Sep 10, 2026, 1:32 PM
Status
Analyzed
Published
Sep 30, 2026, 12:17 PM
Modified
Oct 2, 2026, 8:17 PM
Severity
Important
Public date
Sep 30, 2026, 11:58 AM