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Fencer Intel
critical 9.8

CVE-2026-88920 json

Apache WSS4J: SAML Sender-Vouches Authentication Bypass

published last mo. modified last mo. also EUVD-2026-89793

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

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.

Patch / fix

  • Apache Software Foundation Apache WSS4J 2.4.4, 3.0.6, 4.0.2

Is CVE-2026-88920 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-88920 updated cvss 7.4

org.apache.wss4j/wss4j-ws-security-dom: Apache WSS4J: Authentication bypass via unsigned SAML sender-vouches assertion

  • Red Hat build of Apache Camel 4 for Quarkus 3 wss4j-ws-security-dom 4.0.1.redhat-00003 Red Hat build of Apache Camel for Spring Boot 4 wss4j-ws-security-dom 4.0.1.redhat-00003
    affected: workaround, no fix available
  • Red Hat JBoss Enterprise Application Platform 7 wss4j-ws-security-dom 4.0.1.redhat-00003, jboss-eap-7/eap74-els-openjdk8-openshift-rhel8, jboss-eap-7/eap74-els-openjdk11-openshift-rhel8, jboss-eap-7/eap74-els-openjdk17-openshift-rhel8
    affected: workaround, no fix planned “Will not fix”
  • Red Hat JBoss Enterprise Application Platform 8 wss4j-ws-security-dom 4.0.1.redhat-00003
    affected: workaround, no fix available
  • Red Hat Single Sign-On 7 wss4j-ws-security-dom 4.0.1.redhat-00003
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Build of Apache Camel 3.33.4.redhat wss4j-ws-security-dom 4.0.2.redhat-00007
    fixed: vendor fix RHSA-2026:83670
  • Red Hat Build of Apache Camel 3.33.4.redhat jimfs 1.1, jna 5.8.0, bcel 6.7.0, gax 2.74.1, icu4j 78.2, joni 2.2.6, +1616 more
    not affected: vulnerable code not present
  • Red Hat Fuse 7 wss4j-ws-security-dom 4.0.1.redhat-00003
    not affected: vulnerable code not in execute path
  • Red Hat JBoss Enterprise Application Platform Expansion Pack wss4j-ws-security-dom 4.0.1.redhat-00003
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
last mo.

Exploit prediction

0.58% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Apache Software Foundation Apache WSS4J

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.