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Advisory details: gitlab / maven/org.apache.tomcat/tomcat/CVE-2026-55955
Advisory ID gitlab/maven/org.apache.tomcat/tomcat/CVE-2026-55955
Aliases CVE-2026-55955
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (3)
CWE-287 Improper Authentication
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
There are no known severity scores.
Reference id Reference type URL
CVE-2026-55955 https://nvd.nist.gov/vuln/detail/CVE-2026-55955
g4p5sf45p3f9r011pwqs9r54yd64s106 Advisory https://lists.apache.org/thread/g4p5sf45p3f9r011pwqs9r54yd64s106
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
There are no known vectors.

There are no SSVC decisions available.