---
cve: "CVE-2026-72722"
severity: "MEDIUM"
cvss: 4.3
epss: "32%"
vendor: "discourse"
kev: false
exploited: false
published: "2026-08-10 16:19:49"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-15T18:50:45+02:00"
---

# CVE-2026-72722

> 4.3 MEDIUM · 🧪 PoC

## Beschreibung

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, TopicLink.extract_from, TopicLink.ensure_entry_for, and TopicLink.duplicate_lookup do not consistently enforce Guardian.can_see? checks when processing internal links. An authenticated user can submit links to restricted topics, private messages, or hidden posts and receive canonicalized slugs or titles in the composer_messages duplicate_lookup response even though the targets are not visible to that user. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 94190ccb5176eb4ab1f2b509fcecc3fc682dadae (Commit)
- 3a87be49d621faddf5cea3f6a090adc9b7cbb7e8 (Commit)

## Referenzen

- <https://github.com/discourse/discourse/security/advisories/GHSA-4fx9-5m29-83p4>
- <https://github.com/discourse/discourse/pull/42091>
- <https://github.com/discourse/discourse/pull/42092>
- <https://github.com/discourse/discourse/pull/42093>
- <https://github.com/discourse/discourse/pull/42094>
- <https://github.com/discourse/discourse/commit/45abd925e46e8be40d2d047bced26628f26e4e31>
- <https://github.com/discourse/discourse/commit/7d7ce546ac86e24a6512b321ace69fc52fe37bf4>
- <https://github.com/discourse/discourse/commit/836a251d54a1004fb1c463a7d299b933b176191f>
- <https://github.com/discourse/discourse/commit/e54ba27eacee0f14f315e510e287e7ac2e4bdb1a>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-72722) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_