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CVE-2026-86248 is an Apache Tomcat certificate-validation vulnerability caused by an incomplete remediation of CVE-2026-34500. In affected deployments using the FFM implementation, OCSP validation may soft-fail during CLIENT_CERT authentication even when soft-fail behavior is disabled. Consequently, Tomcat may accept client-certificate authentication in scenarios where failed revocation-status validation should cause authentication to fail. Affected versions are Tomcat 11.0.0-M14 through 11.0.25, 10.1.22 through 10.1.59, and 9.0.92 through 9.0.121.
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No public exploit code observed for this vulnerability.
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An OCSP certificate-validation flaw that can permit CLIENT_CERT authentication despite disabled soft-fail under the FFM implementation.
An Apache Tomcat certificate-validation flaw in which incomplete OCSP handling can permit CLIENT_CERT authentication despite disabled soft-fail behavior under FFM.
An Apache Tomcat CLIENT_CERT authentication flaw in which authentication may not fail as expected in certain scenarios when soft fail is disabled.
Apache Tomcat CLIENT_CERT authentication flaw where authentication may not fail as expected when soft fail is disabled.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.