---
cve: "CVE-2021-3964"
severity: "MEDIUM"
cvss: 4.3
epss: "0.8%"
vendor: "Elgg"
kev: false
exploited: false
published: "2021-12-01 11:25:10"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-28T07:28:35+02:00"
---

# CVE-2021-3964

> 4.3 MEDIUM · 🧪 PoC

## Beschreibung

elgg is vulnerable to Authorization Bypass Through User-Controlled Key

## CVSS-Vektor

```
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
```

| 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 | Gering | warn |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- eebb1abc566572a2c7ce4a4646ee40ea6dce428f (Commit)
- d9fcad76ee380ea17edd61d13d0f87828ea3f744 (Commit)

## Referenzen

- <https://huntr.dev/bounties/a4df45d6-b739-4299-967f-c960b569383a>
- <https://github.com/elgg/elgg/commit/d9fcad76ee380ea17edd61d13d0f87828ea3f744>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2021-3964) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_