OCTOBER 7, 2026
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Case File

CVE-2026-86248

CRITICAL · CVSS 9.8 EPSS 0.39%

Source: NVD + CISA KEV + EPSS · Published 2026-09-23 · Last synced 2026-10-07

CyberRota Analysis

AI-Generated

Apache Tomcat versions 11.0.0-M14 to 11.0.25, 10.1.22 to 10.1.59, and 9.0.92 to 9.0.121 are vulnerable due to a failure in CLIENT_CERT authentication when soft fail is disabled, potentially allowing unauthorized access. This critical vulnerability, rated 9.8 on the CVSS scale, poses a significant risk to organizations relying on these versions for secure client authentication. Administrators of affected Apache Tomcat instances should prioritize upgrading to the patched versions 11.0.26, 10.1.60, or 9.0.122 to mitigate this risk.

CVE
CVE-2026-86248
Severity
CRITICAL
CVSS
9.8
EPSS
0.39%
Apache

Original NVD 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.