---
id: CVE-2026-72723
title: Discourse is an open-source discussion platform
summary: >-
  Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2,
  2026.6.1, and 2026.7.0, SiteSerializer.anonymous_default_navigation_menu_tags
  serializes tags from SiteSetting.default_navigation_menu_tags without applying
  Di…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-862
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-2026-72723'
references:
  - url: >-
      https://github.com/discourse/discourse/commit/0248e9ca82d0493037a9ca04d73904ccfad795f9
    label: security-advisories@github.com
  - url: >-
      https://github.com/discourse/discourse/commit/03444ddb74d535dda557350f4c5800a6ec2669d7
    label: security-advisories@github.com
  - url: >-
      https://github.com/discourse/discourse/commit/900f51c147913f667e64484c2f2dd48c723314ac
    label: security-advisories@github.com
  - url: >-
      https://github.com/discourse/discourse/commit/da84c677213cac3b024e753f180f45472b89efde
    label: security-advisories@github.com
  - url: 'https://github.com/discourse/discourse/pull/42091'
    label: security-advisories@github.com
  - url: 'https://github.com/discourse/discourse/pull/42092'
    label: security-advisories@github.com
  - url: 'https://github.com/discourse/discourse/pull/42093'
    label: security-advisories@github.com
  - url: 'https://github.com/discourse/discourse/pull/42094'
    label: security-advisories@github.com
  - url: >-
      https://github.com/discourse/discourse/security/advisories/GHSA-4p6q-h74v-5j7p
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00525
epssPercentile: 0.42089
ingestedAt: '2026-09-08T21:11:12.273Z'
---

## Overview

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, SiteSerializer.anonymous_default_navigation_menu_tags serializes tags from SiteSetting.default_navigation_menu_tags without applying DiscourseTagging.filter_visible for the anonymous viewer. An unauthenticated user can retrieve restricted tag names and descriptions through /site.json when those tags are limited by inaccessible categories, category tag groups, or tag-group permissions. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

## Remediation

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