---
id: CVE-2026-59830
title: Discourse is an open-source discussion platform
summary: >-
  Discourse is an open-source discussion platform. Prior to 2026.7.0, the post
  action component failed to escape user-controlled display names before
  interpolating them into an HTML string passed to trustHTML. A user who could
  choose a cra…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: discourse
product: discourse
affected:
  - discourse < 2026.7.0
published: '2026-09-21'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T17:17:50.143'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-59830'
references:
  - url: >-
      https://github.com/discourse/discourse/commit/dd786594ddd088657a7e6f9fefba5bd889965fe4
    label: security-advisories@github.com
  - url: 'https://github.com/discourse/discourse/releases/tag/v2026.7.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/discourse/discourse/security/advisories/GHSA-x6mf-p7cg-69rw
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
epss: 0.00289
epssPercentile: 0.19044
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-22T14:12:11.883033Z'
ingestedAt: '2026-09-21T21:53:57.430Z'
---

## Overview

Discourse is an open-source discussion platform. Prior to 2026.7.0, the post action component failed to escape user-controlled display names before interpolating them into an HTML string passed to trustHTML. A user who could choose a crafted display name could persist markup in post action descriptions. Viewing the affected user activity streams could execute attacker-controlled script in another user's browser. This issue is fixed in version 2026.7.0.

## Remediation

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