Critical 9.8Published Sep 30, 2026

CVE-2026-88920Apache WSS4J: SAML Sender-Vouches Authentication Bypass

Updated under an hour ago (Oct 27, 2026, 10:30 PM ET)

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It affects Apache Software Foundation Apache WSS4J and 1 other product. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.57%, higher than 46% of scored CVEs.

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Every CVE for Apache Software Foundation Apache WSS4J

Exploited in the last 30 days

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: 9.8 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-287
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.57% (percentile 46)
Assigned by: apache
NVD analysis: Analyzed
Record last updated: Sep 30, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Apache Software Foundation Apache WSS4J apache_software_foundation:apache_wss4j (from the name)	from 4.0.0 before 4.0.2; from 3.0.0 before 3.0.6; before 2.4.4	CNA record
apache wss4j apache:wss4j	before 2.4.4; from 3.0.0 before 3.0.6; from 4.0.0 before 4.0.2	NVD

References

References

https://lists.apache.org/thread.html/grt43m3bgbzz0mk0cnho3rcybb1j01z9	vendor-advisory, mailing-list
http://www.openwall.com/lists/oss-security/2026/09/30/10	mailing-list, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.