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Apache WSS4J Library Addresses Seven Vulnerabilities Including Authentication Bypass Flaws

The Apache WSS4J library, used to apply WS-Security to SOAP messages in Java environments, has received updates fixing seven vulnerabilities. The development team disclosed multiple security advisories on September 30, 2026, covering the issues. Three vulnerabilities received an Important severity rating: CVE-2026-88920, CVE-2026-89238, and CVE-2026-95616. CVE-2026-88920 allows authentication bypass in the DOM security processor by injecting attacker-controlled keys into crafted unsigned sender-vouches SAML assertions. CVE-2026-89238 stems from improper handling of encryption headers, enabling attackers to force plaintext elements to be treated as decrypted headers and bypass security policies. The remaining four vulnerabilities were also resolved in the same coordinated update release.

Security NEXTTranslated from Japanese

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The Apache WSS4J library, which enables the application of WS-Security to SOAP messages in Java environments, has been found to contain multiple vulnerabilities. A coordinated update addressing all seven issues is now available.

On September 30, 2026, the development team published several security advisories confirming the fixes. Three of the vulnerabilities were rated Important: CVE-2026-88920, CVE-2026-89238, and CVE-2026-95616.

CVE-2026-88920 is an authentication bypass flaw in the DOM security processor. An attacker can insert a controlled key into a crafted unsigned sender-vouches SAML assertion, allowing forged authenticated SOAP messages to be accepted.

CVE-2026-89238 involves a processing issue with encryption headers. Attackers can supply plaintext elements that are incorrectly treated as decrypted headers, undermining confidentiality protections and bypassing defined security policies.

The remaining four vulnerabilities, tracked as CVE-2026-85532, CVE-2026-87830, CVE-2026-92121, and CVE-2026-92899, were also resolved in the same release. Users are advised to apply the latest patched versions of Apache WSS4J immediately.

Apache WSS4JCVE-2026-88920CVE-2026-89238CVE-2026-95616WS-SecuritySAML assertion
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