Improper Authentication Vulnerability in Apache Tomcat
CVE-2026-55955

6.5MEDIUM

Key Information:

Vendor

Apache
Status
Apache Tomcat
Vendor
CVE Published:
29 June 2026

What is CVE-2026-55955?

An improper authentication vulnerability exists in Apache Tomcat, enabling potential replay attacks targeting the EncryptionInterceptor within the cluster component. This issue affects a range of Apache Tomcat versions from 7.0.100 to 11.0.22. Users are strongly encouraged to update to the latest versions (11.0.23, 10.1.56, 9.0.119) to mitigate this vulnerability effectively.

Affected Version(s)

Apache Tomcat 11.0.0-M1 <= 11.0.22

Apache Tomcat 10.1.0-M1 <= 10.1.55

Apache Tomcat 9.0.13 <= 9.0.118

References

https://lists.apache.org/thread/g4p5sf45p3f9r011pwqs9r54y...
vendor-advisory

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
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

.