---
cve: "CVE-2026-72720"
severity: "MEDIUM"
cvss: 6.4
epss: "30%"
vendor: "discourse"
kev: false
exploited: false
published: "2026-08-10 15:41:51"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T03:28:58+02:00"
---

# CVE-2026-72720

> 6.4 MEDIUM · 🧪 PoC

## Beschreibung

Discourse is an open-source discussion platform. Prior to 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0-latest.1, Discourse has HTML injection in PrettyText.format_for_email because cooked attribute values are reparsed as markup. Crafted Vimeo iframe sources, secure-upload URLs or dimensions, and hashtag data-slug values can cause decoded attribute text to be reinterpreted as HTML. The vulnerable conversion also fails to strictly validate the Vimeo iframe host and path, allowing non-Vimeo allowlisted iframes to be converted. This issue is fixed in versions 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0-latest.1.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/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 | Verändert | bad |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- b6af77c0382ac61817e825e4e285217327772b54 (Commit)
- ac368a8cac47e413b99f122c890e32c133a4bacc (Commit)

## Referenzen

- <https://github.com/discourse/discourse/security/advisories/GHSA-3q6f-6gm9-m35v>
- <https://github.com/discourse/discourse/pull/42244>
- <https://github.com/discourse/discourse/pull/42245>
- <https://github.com/discourse/discourse/pull/42246>
- <https://github.com/discourse/discourse/pull/42247>
- <https://github.com/discourse/discourse/commit/234ee88a5b9b53bf938c53351eab20130323485f>
- <https://github.com/discourse/discourse/commit/4b639a52f47fb3d46093bece9df147e4e9517a11>
- <https://github.com/discourse/discourse/commit/a5d3b112d598242c1d1803d5a77bf98d5fdabd75>
- <https://github.com/discourse/discourse/commit/b25a074b165253e01fc4c8911b980fc68338ea16>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-72720) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_