---
title: "CVE-2026-65182: Apache Tomcat has an Improper Access Control, Incorrect Authorization vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-65182/
description: "CVE-2026-65182 (org.apache.tomcat:tomcat (Maven)): Improper Access Control, Incorrect Authorization vulnerability in Apache Tomcat leads to security…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-08-25
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-65182"
kev: false
cvss: 9.1
epss: 0.00538
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-65182: Apache Tomcat has an Improper Access Control, Incorrect Authorization vulnerability

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.5% , percentile 44: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 44% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes org.apache.tomcat:tomcat (Maven) >= 11.0.0-M1, < 11.0.25, fixed in 11.0.25 ; org.apache.tomcat:tomcat (Maven) >= 10.1.0-M1, < 10.1.58, fixed in 10.1.58 ; org.apache.tomcat:tomcat (Maven) >= 9.0.0-M1, < 9.0.121, fixed in 9.0.121 ; org.apache.tomcat:tomcat (Maven) >= 8.5.0, <= 8.5.100, no fixed version listed . Check your lockfile, including transitive dependencies.
- Editorial verdict: Patch this week. Apache Tomcat August 2026: Security Constraint Bypasses — Upgrade Tomcat, including the copy embedded in Spring Boot apps, this week; the access-control bypasses matter wherever you rely on web.xml security constraints or container authentication, and none is known to be exploited.

## What it is

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.

## Affected packages

- Maven `org.apache.tomcat:tomcat` >= 11.0.0-M1, < 11.0.25 → fixed: 11.0.25
- Maven `org.apache.tomcat:tomcat` >= 10.1.0-M1, < 10.1.58 → fixed: 10.1.58
- Maven `org.apache.tomcat:tomcat` >= 9.0.0-M1, < 9.0.121 → fixed: 9.0.121
- Maven `org.apache.tomcat:tomcat` >= 8.5.0, <= 8.5.100 → fixed: none listed
- Maven `org.apache.tomcat:tomcat` >= 7.0.0, <= 7.0.109 → fixed: none listed
- Maven `org.apache.tomcat:tomcat-catalina` >= 11.0.0-M1, < 11.0.25 → fixed: 11.0.25
- Maven `org.apache.tomcat:tomcat-catalina` >= 10.1.0-M1, < 10.1.58 → fixed: 10.1.58
- Maven `org.apache.tomcat:tomcat-catalina` >= 9.0.0-M1, < 9.0.121 → fixed: 9.0.121
- Maven `org.apache.tomcat:tomcat-catalina` >= 8.5.0, <= 8.5.100 → fixed: none listed
- Maven `org.apache.tomcat:tomcat-catalina` >= 7.0.0, <= 7.0.109 → fixed: none listed
- Maven `org.apache.tomcat.embed:tomcat-embed-core` >= 11.0.0-M1, < 11.0.25 → fixed: 11.0.25
- Maven `org.apache.tomcat.embed:tomcat-embed-core` >= 10.1.0-M1, < 10.1.58 → fixed: 10.1.58
- Maven `org.apache.tomcat.embed:tomcat-embed-core` >= 9.0.0-M1, < 9.0.121 → fixed: 9.0.121
- Maven `org.apache.tomcat.embed:tomcat-embed-core` >= 8.5.0, <= 8.5.100 → fixed: none listed
- Maven `org.apache.tomcat.embed:tomcat-embed-core` >= 7.0.0, <= 7.0.109 → fixed: none listed

## Affected products (CVE record)

- Apache Software Foundation Apache Tomcat: 11.0.0-M1 <= 11.0.24, 10.1.0-M1 <= 10.1.57, 9.0.0.M1 <= 9.0.120, 8.5.0 <= 8.5.100, 7.0.0 <= 7.0.109

## Severity

- CISA-ADP CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.54% probability of exploitation activity in the next 30 days; percentile 44.

## Sources

- [lists.apache.org](https://lists.apache.org/thread/joosxvzc9b49ttj8lj0jw9mqt0ml767m)
- [GitHub Advisory GHSA-gcx9-497g-6cp6](https://github.com/advisories/GHSA-gcx9-497g-6cp6)
- [CVE.org record CVE-2026-65182](https://www.cve.org/CVERecord?id=CVE-2026-65182)
- [NVD entry CVE-2026-65182](https://nvd.nist.gov/vuln/detail/CVE-2026-65182)
- [openwall.com](http://www.openwall.com/lists/oss-security/2026/08/26/1)
- [github.com](https://github.com/apache/tomcat/commit/8bafd79a3b54684e80e9cb1bafd4746aede7d3f5)
- [github.com](https://github.com/apache/tomcat/commit/b2c56ec8f20c66773a1a813034ffcdb60841f1cf)
- [github.com](https://github.com/apache/tomcat/commit/b79752d2a8578d94743e2a95c50af297f780c0df)
- [tomcat.apache.org](https://tomcat.apache.org/security-10.html)
- [tomcat.apache.org](https://tomcat.apache.org/security-11.html)
- [tomcat.apache.org](https://tomcat.apache.org/security-9.html)

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Source page: https://erroneo.us/security/cve/CVE-2026-65182/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt