CVE-2026-55955

Severity CVSS v4.0:

Pending analysis

Type:

CWE-287 Authentication Issues

Publication date:

29/06/2026

Last modified:

02/07/2026

Description

Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the EncryptionInterceptor in the cluster component.<br /> <br /> This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.13 through 9.0.18, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109.<br /> <br /> Users are recommended to upgrade to version 11.0.23, 10.1.56, 9.0.119, which fixes the issue.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N CVSS v3.1 Severity and Metrics:

Base Score: 6.50 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): Low
Integrity (I): Low
Availability (A): None

Base Score 3.x

6.50

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:apache:tomcat::::::::		9.0.19 (excluding)
cpe:2.3:a:apache:tomcat::::::::	10.1.0 (including)	10.1.56 (excluding)
cpe:2.3:a:apache:tomcat::::::::	11.0.0 (including)	11.0.23 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2026-55955

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools