CVE-2026-55955: CWE-287 Improper Authentication in Apache Software Foundation Apache Tomcat
Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the EncryptionInterceptor in the cluster component. 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. Users are recommended to upgrade to version 11.0.23, 10.1.56, 9.0.119, which fixes the issue.
AI Analysis
Technical Summary
CVE-2026-55955 describes an improper authentication vulnerability in Apache Tomcat's EncryptionInterceptor used in the cluster component. This flaw permits replay attacks against the authentication mechanism, potentially allowing unauthorized actions within clustered Tomcat environments. The vulnerability affects Apache Tomcat versions from 11.0.0-M1 through 11.0.22, 10.1.0-M1 through 10.1.55, 9.0.13 through 9.0.18, 8.5.38 through 8.5.100, and 7.0.100 through 7.0.109. The vendor has addressed the issue in versions 11.0.23, 10.1.56, and 9.0.119.
Potential Impact
The vulnerability allows replay attacks due to improper authentication in the cluster component's EncryptionInterceptor. This could enable an attacker to bypass authentication controls in clustered Apache Tomcat deployments, potentially leading to unauthorized access or actions within the cluster. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Users should upgrade affected Apache Tomcat versions to 11.0.23, 10.1.56, or 9.0.119 or later, where the vulnerability is fixed. No other mitigation or temporary workaround is indicated in the available data.
CVE-2026-55955: CWE-287 Improper Authentication in Apache Software Foundation Apache Tomcat
Description
Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the EncryptionInterceptor in the cluster component. 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. Users are recommended to upgrade to version 11.0.23, 10.1.56, 9.0.119, which fixes the issue.
Affected software
pkg:maven/org.apache.tomcat/tomcatRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-55955 describes an improper authentication vulnerability in Apache Tomcat's EncryptionInterceptor used in the cluster component. This flaw permits replay attacks against the authentication mechanism, potentially allowing unauthorized actions within clustered Tomcat environments. The vulnerability affects Apache Tomcat versions from 11.0.0-M1 through 11.0.22, 10.1.0-M1 through 10.1.55, 9.0.13 through 9.0.18, 8.5.38 through 8.5.100, and 7.0.100 through 7.0.109. The vendor has addressed the issue in versions 11.0.23, 10.1.56, and 9.0.119.
Potential Impact
The vulnerability allows replay attacks due to improper authentication in the cluster component's EncryptionInterceptor. This could enable an attacker to bypass authentication controls in clustered Apache Tomcat deployments, potentially leading to unauthorized access or actions within the cluster. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Users should upgrade affected Apache Tomcat versions to 11.0.23, 10.1.56, or 9.0.119 or later, where the vulnerability is fixed. No other mitigation or temporary workaround is indicated in the available data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-06-17T18:04:49.663Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a42de5d27e9c7971980716f
Added to database: 06/29/2026, 21:06:37 UTC
Last enriched: 06/29/2026, 21:21:42 UTC
Last updated: 06/29/2026, 22:06:43 UTC
Views: 4
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