---
id: CVE-2026-86248
title: >-
  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…
summary: >-
  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…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-287
vendor: Apache Software Foundation
product: Apache Tomcat
affected:
  - apache_tomcat >= 11.0.0-M14 <= 11.0.25
  - apache_tomcat >= 10.1.22 <= 10.1.59
  - apache_tomcat >= 9.0.92 <= 9.0.121
published: '2026-09-23'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T17:58:26.570'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86248'
references:
  - url: 'https://lists.apache.org/thread/nmkmjp9l53y8h3oc4n8fc0bkw9dv15sk'
    label: security@apache.org
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-23T16:14:53.442167Z'
ingestedAt: '2026-09-23T12:24:04.186Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.