Improper Authentication Vulnerability in Apache Tomcat by Apache
CVE-2026-75973

7.3HIGH

Key Information:

Vendor

Apache
Status
Apache Tomcat
Vendor
CVE Published:
23 September 2026

What is CVE-2026-75973?

An improper authentication issue has been identified in Apache Tomcat that occurs when Jakarta Authentication is configured with SimpleAuthConfigProvider as the default provider. This vulnerability leads to the realm for the first web application that authenticates a request being used across all web applications using that provider. Affected versions include Apache Tomcat 11.0.0-M1 to 11.0.25, 10.1.0-M1 to 10.1.59, and 9.0.0.M4 to 9.0.121, alongside EOL versions from 8.5.0 to 8.5.100. Users should upgrade to the latest versions 11.0.26, 10.1.60, or 9.0.122 to mitigate this risk.

Affected Version(s)

Apache Tomcat 11.0.0-M1 <= 11.0.25

Apache Tomcat 10.1.0-M1 <= 10.1.59

Apache Tomcat 9.0.0.M4 <= 9.0.121

References

https://lists.apache.org/thread/njjcdkkzqyzx4n3ffc4ffjmyh...
vendor-advisory

CVSS V3.1

Score:
7.3
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

0xCc.zhang
.