CVE-2026-86248

Critical

Description

CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M14 through 11.0.25, from 10.1.22 through 10.1.59, from 9.0.92 through 9.0.121. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

SeverityCritical

CVSS9.8

Exploit probability—

Product

Apache Tomcat

PublishedSep 23, 2026

First seenSep 23, 2026

Weakness typeCWE-287Improper authentication

How to fix

Vendor advisories

lists.apache.org/thread/nmkmjp9l53y8h3oc4n8fc0bkw9dv15sk

Affected products

Product	Affected versions	Fixed in
Apache Software Foundation Apache Tomcat	11.0.0-M14 ≤ v ≤ 11.0.25, 10.1.22 ≤ v ≤ 10.1.59, 9.0.92 ≤ v ≤ 9.0.121	—

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