# CVE-2026-66422

## Summary

- **CVE ID:** CVE-2026-66422
- **Severity:** HIGH
- **CVSS Score:** 8.1 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H)
- **CWE:** CWE-285
- **Published:** Aug 25, 2026
- **Last Modified:** Aug 26, 2026

## Description

Improper Authorization vulnerability in Apache Tomcat cause by security-role-ref definitions being incorrectly used as role aliases within the Realm in additional to the correct usage with Request.isUserInRole().



This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.25 through 9.0.120.



The following versions were EOL at the time the CVE was created but are 
known to be affected: from 8.5.46 through 8.5.100, from 7.0.97 through 7.0.109. Other unsupported versions may also be affected.



Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.

## Affected Products

- Apache Software Foundation — Apache Tomcat (11.0.0-M1)
- Apache Software Foundation — Apache Tomcat (10.1.0-M1)
- Apache Software Foundation — Apache Tomcat (9.0.25)
- Apache Software Foundation — Apache Tomcat (8.5.46)
- Apache Software Foundation — Apache Tomcat (7.0.97)
- Apache Software Foundation — Apache Tomcat (0)

## References

- [CNA](https://lists.apache.org/thread/j5plylz1b2vhqvbkqn7k58nygxhcpk73)
- [CVE](http://www.openwall.com/lists/oss-security/2026/08/26/6)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.57%
- **EPSS Percentile:** 45.9

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._