Apache Tomcat has an Improper Access Control, Incorrect Authorization vulnerability

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

9.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS

• CVE-2026-65182: 0.65% estimated exploitation activity in the next 30 days; percentile 51.36 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Improper Access Control, Incorrect Authorization vulnerability in Apache Tomcat leads to security constraint bypass if a constraint for a longer path is specified before a more restrictive constraint for a shorter sub-path. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Users are recommended to upgrade to version 11.0.25, 10.1.58, 9.0.121, which fixes the issue.

Published by the source

26 Aug 2026, 00:30 UTC

Last modified by the source

11 Sep 2026, 08:25 UTC

Source last checked

26 Oct 2026, 16:55 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-gcx9-497g-6cp6

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-gcx9-497g-6cp6

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# Patch Next advisory brief: CVE-2026-65182

Advisory: Apache Tomcat has an Improper Access Control, Incorrect Authorization vulnerability
IDs: CVE-2026-65182, GHSA-gcx9-497g-6cp6
Record: https://patchnext.com/advisories/cve-2026-65182 (revision 2, source checked 26 Oct 2026, 16:55 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: org.apache.tomcat:tomcat-catalina 11.0.25, 10.1.58, 9.0.121; org.apache.tomcat.embed:tomcat-embed-core 11.0.25, 10.1.58, 9.0.121; org.apache.tomcat:tomcat 11.0.25, 10.1.58, 9.0.121. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.apache.tomcat:tomcat-catalina: affected >= 11.0.0-M1, < 11.0.25; >= 10.1.0-M1, < 10.1.58; >= 9.0.0-M1, < 9.0.121; >= 8.5.0, <= 8.5.100; >= 7.0.0, <= 7.0.109; fixed in 11.0.25, 9.0.121, 10.1.58
- Maven org.apache.tomcat.embed:tomcat-embed-core: affected >= 11.0.0-M1, < 11.0.25; >= 10.1.0-M1, < 10.1.58; >= 9.0.0-M1, < 9.0.121; >= 8.5.0, <= 8.5.100; >= 7.0.0, <= 7.0.109; fixed in 11.0.25, 9.0.121, 10.1.58
- Maven org.apache.tomcat:tomcat: affected >= 11.0.0-M1, < 11.0.25; >= 10.1.0-M1, < 10.1.58; >= 9.0.0-M1, < 9.0.121; >= 8.5.0, <= 8.5.100; >= 7.0.0, <= 7.0.109; fixed in 11.0.25, 9.0.121, 10.1.58

## Suggested inspection (read-only)
- Maven org.apache.tomcat:tomcat-catalina: check the installed version with your package manager.
- Maven org.apache.tomcat.embed:tomcat-embed-core: check the installed version with your package manager.
- Maven org.apache.tomcat:tomcat: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.apache.tomcat:tomcat-catalina, org.apache.tomcat.embed:tomcat-embed-core, org.apache.tomcat:tomcat.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-gcx9-497g-6cp6 (OSV record GHSA-gcx9-497g-6cp6 lists affected ranges: Maven org.apache.tomcat:tomcat >=11.0.0-M1 =10.1.0-M1 =9.0.0-M1 =8.5.0 =7.0.0 =11.0.0-M1 =10.1.0-M1 =9.0.0-M1 =8.5.0 =7.0.0 =11.0.0-M1 =10.1.0-M1 =9.0.0-M1…)
- Verified: https://github.com/advisories/GHSA-gcx9-497g-6cp6 (GitHub-reviewed advisory GHSA-gcx9-497g-6cp6 lists affected ranges: Maven org.apache.tomcat:tomcat >=11.0.0-M1 =10.1.0-M1 =9.0.0-M1 =8.5.0 =7.0.0 =11.0.0-M1 =10.1.0-M1 =9.0.0-M1 =8.5.0 =7.0.0 =11.0.0-M1 =10.1.0-M1 =9.0.0-M1 =8.5.0 =7.0.0 <=7.0.109)

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