---
cve: "CVE-2026-66422"
severity: "HIGH"
cvss: 8.1
epss: "27.4%"
vendor: "Apache"
kev: false
exploited: false
published: "2026-08-25 22:17:05"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T04:42:02+02:00"
---

# CVE-2026-66422

> 8.1 HIGH

## Beschreibung

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.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Referenzen

- <https://lists.apache.org/thread/j5plylz1b2vhqvbkqn7k58nygxhcpk73>
- <http://www.openwall.com/lists/oss-security/2026/08/26/6>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-66422) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_