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CVE-2026-88920

Apache Wss4j authentication bypass

9.8 CRITICALEPSS 0.57%
  1. Published30 Sept 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Apache Wss4j≥ 3.0.0 < 3.0.6 · ≥ 4.0.0 < 4.0.2 · < 2.4.4

Remediation

Fixed in
Apache Wss4j≥ 3.0.6

References

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Frequently asked

Is CVE-2026-88920 being actively exploited?

CVE-2026-88920 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.57%.

How severe is CVE-2026-88920?

CVE-2026-88920 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.57% probability of exploitation.

Which products are affected by CVE-2026-88920?

Affected products include Apache Wss4j.

How do I fix CVE-2026-88920?

Upgrade affected software to a fixed version, for example Apache Wss4j 3.0.6 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-88920 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.