{"id":"CVE-2026-55955","title":"Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the EncryptionInterceptor in the cluster component.\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55,…","summary":"Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the EncryptionInterceptor in the cluster component.\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55,…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","cwe":["CWE-287","CWE-294"],"vendor":"apache","product":"tomcat","affected":["tomcat < 9.0.19","tomcat >= 10.1.0, < 10.1.56","tomcat >= 11.0.0, < 11.0.23"],"patched":["tomcat 11.0.23"],"published":"2026-06-29","updated":"2026-07-02","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55955","references":[{"url":"https://lists.apache.org/thread/g4p5sf45p3f9r011pwqs9r54yd64s106","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/06/29/24","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55955.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-55955"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2494678"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-55955"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55955"},{"url":"https://access.redhat.com/errata/RHSA-2026:67163"},{"url":"https://access.redhat.com/errata/RHSA-2026:68651"},{"url":"https://access.redhat.com/errata/RHSA-2026:68677"},{"url":"https://access.redhat.com/errata/RHSA-2026:68680"},{"url":"https://access.redhat.com/errata/RHSA-2026:68678"},{"url":"https://access.redhat.com/errata/RHSA-2026:68679"},{"url":"https://access.redhat.com/errata/RHSA-2026:68659"},{"url":"https://access.redhat.com/errata/RHSA-2026:68660"},{"url":"https://access.redhat.com/errata/RHSA-2026:29203"},{"url":"https://access.redhat.com/errata/RHSA-2026:32960"}],"tags":["nvd","csaf","vex","red-hat","score-dispute"],"epss":0.00436,"epssPercentile":0.37726,"ingestedAt":"2026-07-03T13:02:28.104Z","scores":{"nvd":6.5,"vendor":4.2},"slug":"CVE-2026-55955","body":"## Overview\n\nImproper Authentication vulnerability in Apache Tomcat allowed a replay attack against the EncryptionInterceptor in the cluster component.\n\nThis 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.\n\nUsers are recommended to upgrade to version 11.0.23, 10.1.56, 9.0.119, which fixes the issue.\n\n## Affected\n\n- `tomcat < 9.0.19`\n- `tomcat >= 10.1.0, < 10.1.56`\n- `tomcat >= 11.0.0, < 11.0.23`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `tomcat 11.0.23`\n\n## Vendor advisories\n\n- **RHSA-2026:67163** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67163)\n- **RHSA-2026:68651** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-09-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:68651)\n- **RHSA-2026:68677** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68677)\n- **RHSA-2026:68680** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68680)\n- **RHSA-2026:68678** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68678)\n- **RHSA-2026:68679** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68679)\n- **RHSA-2026:68659** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68659)\n- **RHSA-2026:68660** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68660)\n- **RHSA-2026:29203** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-06-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:29203)\n- **RHSA-2026:32960** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-06-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:32960)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat JBoss Web Server 5 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-25 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55955.json)","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}