---
cve: "CVE-2026-27491"
severity: "MEDIUM"
cvss: 6.9
epss: "0.3%"
vendor: "discourse"
kev: false
exploited: false
published: "2026-03-19 21:17:09"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-23T11:52:23+02:00"
---

# CVE-2026-27491

> 6.9 MEDIUM · 🧪 PoC

## Beschreibung

Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, a type coercion issue in a post actions API endpoint allowed non-staff users to issue warnings to other users. Warnings are a staff-only moderation feature. The vulnerability required the attacker to be a logged-in user and to send a specifically crafted request. No data exposure or privilege escalation beyond the ability to create unauthorized user warnings was possible. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 808b2ac23d8ff421563b40203091026732471c60 (Commit)
- f38464e46df1b8c51f7d60826502476908d6bb2b (Commit)

## Referenzen

- <https://github.com/discourse/discourse/security/advisories/GHSA-xq37-5fvf-4m4j>
- <https://github.com/discourse/discourse/commit/60a588f4da4ab0feceb2c44787d4261b4f8757be>
- <https://github.com/discourse/discourse/commit/d3cb203feabc46d765ecb91f348613a2bd531b89>
- <https://github.com/discourse/discourse/commit/f5fef73827da7520efc517357bd2a6bab35d7886>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-27491) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_