---
cve: "CVE-2026-49256"
severity: "MEDIUM"
cvss: 6.3
epss: "37%"
vendor: "discourse"
kev: false
exploited: false
published: "2026-07-09 21:56:40"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T00:42:06+02:00"
---

# CVE-2026-49256

> 6.3 MEDIUM · 🧪 PoC

## Beschreibung

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, restricted tag and tag-group names attached to publicly readable categories as allowed_tags, allowed_tag_groups, or required tag groups could leak to anonymous and unauthorized users through category and group endpoints. 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: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)

- c06899647d758493d95a5b301e573ffa3db1e878 (Commit)
- 4bbdddfc6700ca23604242111d4fa0e00347af97 (Commit)

## Referenzen

- <https://github.com/discourse/discourse/security/advisories/GHSA-mwp7-572g-6qpx>
- <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-2026-49256) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_