---
cve: "CVE-2026-55424"
severity: "HIGH"
cvss: 7.4
epss: "0.4%"
vendor: "discourse"
kev: false
exploited: false
published: "2026-07-09 22:01:22"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T09:21:20+02:00"
---

# CVE-2026-55424

> 7.4 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, a topic "featured link" was not sufficiently normalized and escaped before being rendered in the topic list, allowing a user who can set a featured link to inject JavaScript when default Content Security Policy protections were modified or disabled. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |

## Patch verfügbar (OSV)

- c06899647d758493d95a5b301e573ffa3db1e878 (Commit)
- 4bbdddfc6700ca23604242111d4fa0e00347af97 (Commit)

## Referenzen

- <https://github.com/discourse/discourse/security/advisories/GHSA-695w-7fv8-mxg3>
- <https://github.com/discourse/discourse/commit/1bce8881e4253d9bbab56f011a12ef899b926b59>
- <https://github.com/discourse/discourse/commit/6679d9a5083488bae10c2adbb345c481c583242c>
- <https://github.com/discourse/discourse/commit/6828aee9b15c2655d63b515ac919830bd540ff83>
- <https://github.com/discourse/discourse/commit/c9b9405f5bd0bf0269e505e28e3aad388d7657c5>
- <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-2026-55424) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_