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    CVE-2026-55955

    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.

    Published:Jun 29, 2026
    Last Modified:Jun 30, 2026
    EPS:Jun 29, 2026
    EPSS Score:0.00141
    CVSS Score:6.5

    Affected Products

    Vendor
    Apache
    Product
    Tomcat
    Vendor
    Redhat
    Product
    Hummingbird

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-102 Session Sidejacking
    CAPEC-114 Authentication Abuse
    CAPEC-115 Authentication Bypass
    CAPEC-151 Identity Spoofing
    CAPEC-194 Fake the Source of Data
    CAPEC-22 Exploiting Trust in Client
    CAPEC-509 Kerberoasting
    CAPEC-555 Remote Services with Stolen Credentials
    CAPEC-561 Windows Admin Shares with Stolen Credentials
    CAPEC-57 Utilizing REST's Trust in the System Resource to Obtain Sensitive Data
    CAPEC-593 Session Hijacking
    CAPEC-60 Reusing Session IDs (aka Session Replay)
    CAPEC-633 Token Impersonation
    CAPEC-644 Use of Captured Hashes (Pass The Hash)
    CAPEC-645 Use of Captured Tickets (Pass The Ticket)
    CAPEC-650 Upload a Web Shell to a Web Server
    CAPEC-652 Use of Known Kerberos Credentials
    CAPEC-701 Browser in the Middle (BiTM)
    CAPEC-94 Adversary in the Middle (AiTM)

    Related CVEs

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High