What is CVE-2026-89238?

CVE-2026-89238 is a critical-severity vulnerability in Apache Software Foundation Wss4j, classified under Insufficient Verification of Data Authenticity. CVSS score: 9.1/10. Published 2026-09-30.

How severe is CVE-2026-89238?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Apache Software Foundation Wss4j

CVE-2026-89238

WSS4J EncryptedHeader child confusion could promote an attacker-controlled plaintext element as the decrypted header, leading to incorrect confidentiality coverage and possible policy bypass. Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.

Published 2026-09-30 · last modified 2026-09-30.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Apache Software Foundation Wss4j

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

lists.apache.org/thread.html/1lv4hpl8kon1ns5txjnhn2m2sh9rl22w (vendor-advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-89238?: CVE-2026-89238 is a critical-severity vulnerability in Apache Software Foundation Wss4j, classified under Insufficient Verification of Data Authenticity. CVSS score: 9.1/10. Published 2026-09-30.
How severe is CVE-2026-89238?: Critical severity. CVSS v3 base score is 9.1 out of 10.