---
cve: "CVE-2021-37633"
severity: "HIGH"
cvss: 7.4
epss: "0.8%"
vendor: "discourse"
kev: false
exploited: false
published: "2021-08-09 20:15:07"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T10:59:22+02:00"
---

# CVE-2021-37633

> 7.4 HIGH · 🧪 PoC

## Beschreibung

Discourse is an open source discussion platform. In versions prior to 2.7.8 rendering of d-popover tooltips can be susceptible to XSS attacks. This vulnerability only affects sites which have modified or disabled Discourse's default Content Security Policy. This issue is patched in the latest `stable` 2.7.8 version of Discourse. As a workaround users may ensure that the Content Security Policy is enabled, and has not been modified in a way which would make it more vulnerable to XSS attacks.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 18b6f4ecf6d3513af90b8a54a3514dfa160044d8 (Commit)
- 38199424bc840d2ef002cd1e9bffdbb99191eb47 (Commit)

## Referenzen

- <https://github.com/discourse/discourse/security/advisories/GHSA-v3v8-3m5w-pjp9>
- <https://github.com/discourse/discourse/commit/38199424bc840d2ef002cd1e9bffdbb99191eb47>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2021-37633) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_