---
cve: "CVE-2026-55420"
severity: "HIGH"
cvss: 7.5
epss: "35%"
vendor: "discourse"
kev: false
exploited: false
published: "2026-07-09 18:16:54"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T19:16:58+02:00"
---

# CVE-2026-55420

> 7.5 HIGH · 🧪 PoC

## Beschreibung

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, under certain non-default configurations, processing of PDF uploads could be exploited to obtain RCE on the server. This issue is patched in 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- c06899647d758493d95a5b301e573ffa3db1e878 (Commit)
- 4bbdddfc6700ca23604242111d4fa0e00347af97 (Commit)

## Referenzen

- <https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3>
- <https://github.com/discourse/discourse/commit/ca5a7e06167561928556afa2f237d67e459c6914>
- <https://github.com/discourse/discourse/releases/tag/v2026.1.5>
- <https://github.com/discourse/discourse/releases/tag/v2026.4.2>
- <https://github.com/discourse/discourse/releases/tag/v2026.5.1>
- <https://github.com/discourse/discourse/releases/tag/v2026.6.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-55420) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_