What is CVE-2026-43515?

CVE-2026-43515 is a critical-severity vulnerability in Apache Tomcat, classified under Improper Authorization. CVSS score: 9.1/10. Published 2026-05-12.

How severe is CVE-2026-43515?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Auth bypass in Apache Tomcat

CVE-2026-43515

Improper Authorization vulnerability when multiple method constraints define an HTTP method for the same extension in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9…

EPSS: 0.001 (26.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Apache Tomcat
Apache Software Foundation Tomcat — versions 11.0.0-M1, 10.1.0-M1, 9.0.0.M1

Weakness classification (CWE)

CWE-285 — Improper Authorization

References

security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-43515?: CVE-2026-43515 is a critical-severity vulnerability in Apache Tomcat, classified under Improper Authorization. CVSS score: 9.1/10. Published 2026-05-12.
How severe is CVE-2026-43515?: Critical severity. CVSS v3 base score is 9.1 out of 10.