---
cve: "CVE-2021-26084"
severity: "CRITICAL"
cvss: 9.8
epss: "100%"
vendor: "Atlassian"
kev: true
exploited: true
published: "2021-08-30 06:30:14"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T06:41:12+02:00"
---

# CVE-2021-26084

> 9.8 CRITICAL · ⚠️ CISA KEV (1781 Tage) · 🔓 Exploited · 🧪 PoC

## Beschreibung

In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are before version 6.13.23, from version 6.14.0 before 7.4.11, from version 7.5.0 before 7.11.6, and from version 7.12.0 before 7.12.5.

## CVSS-Vektor

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

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

## Exploit-Evidenz

- [EDB-50243 — Confluence Server 7.12.4 - 'OGNL injection' Remote Code Execution (RCE) (Unauthenticated)](https://www.exploit-db.com/exploits/50243)

## Referenzen

- <https://jira.atlassian.com/browse/CONFSERVER-67940>
- <http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2021-26084) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_