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CVE-2026-65182 – Security Constraint Bypass (Improper Access Control) – Apache Tomcat 7.0.0–7.0.109,

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Summary

CVE-2026-65182 is an improper access control / incorrect authorization vulnerability in Apache Tomcat’s security constraint processing. When a <security-constraint> is defined for a longer URL path before a more restrictive constraint defined for a shorter sub-path, Tomcat can apply the constraints in the wrong order, causing the more restrictive rule to be bypassed. This is a network-exploitable, unauthenticated issue rated CRITICAL (CVSS 9.1) that can expose protected resources to unauthorized users.

Technical details

  • Root cause: Tomcat’s constraint-matching logic evaluates security constraints against request paths without correctly prioritizing more restrictive sub-path constraints over less restrictive parent-path constraints.
  • Trigger condition: a deployment where a security constraint for a longer path (e.g. /admin/sensitive/) is declared before a more restrictive constraint for a shorter sub-path (e.g. /admin/) in web.xml or equivalent configuration.
  • Attack vector: network, no authentication or user interaction required (AV:N/AC:L/PR:N/UI:N).
  • Impact: unauthorized access to resources that should be protected by access-control constraints, resulting in high confidentiality and integrity impact; no availability impact.

Affected software

  • Apache Tomcat 11.0.0-M1 through 11.0.24
  • Apache Tomcat 10.1.0-M1 through 10.1.57
  • Apache Tomcat 9.0.0.M1 through 9.0.120
  • Apache Tomcat 8.5.0 through 8.5.100
  • Apache Tomcat 7.0.0 through 7.0.109

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation and recommended actions

  • Immediate: upgrade to Apache Tomcat 11.0.25, 10.1.58, or 9.0.121, which contain the fix.
  • Note: Tomcat 8.5.x and 7.0.x are listed as affected version ranges but are past their end-of-life support windows and no fixed release is available for these branches; organizations running these versions should migrate to a supported, patched branch (9.0.121+, 10.1.58+, or 11.0.25+).
  • If immediate patching is not possible: review and reorder <security-constraint> declarations so that constraints for shorter, more restrictive sub-paths are defined before constraints for longer parent paths, and audit access logs for unauthorized access to protected resources.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Page title: Apache Tomcat 9 (9.0.121), Apache Tomcat/9.0.121
  • Raw response body: a heading reading Apache Tomcat/9.0.121, a paragraph reading Apache Tomcat/9.0.121, and the text "If you’re seeing this, you’ve successfully installed Tomcat" [{"name": "CVE-2026-65182 at NVD", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-65182"}, {"name": "Apache Tomcat 9 Security Advisory", "url": "https://tomcat.apache.org/security-9.html"}, {"name": "Apache Tomcat 10 Security Advisory", "url": "https://tomcat.apache.org/security-10.html"}, {"name": "Apache Tomcat 11 Security Advisory", "url": "https://tomcat.apache.org/security-11.html"}]

References

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