---
id: CVE-2026-72728
title: Discourse is an open-source discussion platform
summary: >-
  Discourse is an open-source discussion platform. Prior to 2026.1.7, an
  authenticated user could submit specially formed URLs that bypassed the Onebox
  allowlist and embedded malicious content in a site. This issue is fixed in
  versions 202…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-20
published: '2026-08-10'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:54:37.790'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-72728'
references:
  - url: >-
      https://github.com/discourse/discourse/commit/92eec47e8b477cb8b4ccdb237e26dc1ba8f8b76b
    label: security-advisories@github.com
  - url: >-
      https://github.com/discourse/discourse/security/advisories/GHSA-qp9j-3v7r-wrvr
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00313
epssPercentile: 0.21507
ingestedAt: '2026-09-08T21:11:12.273Z'
---

## Overview

Discourse is an open-source discussion platform. Prior to 2026.1.7, an authenticated user could submit specially formed URLs that bypassed the Onebox allowlist and embedded malicious content in a site. This issue is fixed in versions 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0-latest.1.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.