---
id: CVE-2026-59829
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 2026.7.1, on sites with category group moderation enabled, the
  review queue could include an excerpt (and permalink) of the private message
  attac…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-862
published: '2026-08-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:09:01.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-59829'
references:
  - url: >-
      https://github.com/discourse/discourse/commit/4df0e54f59361c78606b578ad12a2c39b4dd9f59
    label: security-advisories@github.com
  - url: >-
      https://github.com/discourse/discourse/commit/58e45dc7c92d19d5294c73fbcd3833c73dc51754
    label: security-advisories@github.com
  - url: >-
      https://github.com/discourse/discourse/commit/74c8522a197658c69b0adefa182f601ce85dcefa
    label: security-advisories@github.com
  - url: >-
      https://github.com/discourse/discourse/commit/e56bd3ec58ae387946220821d1ce214eed02d1b9
    label: security-advisories@github.com
  - url: 'https://github.com/discourse/discourse/pull/41527'
    label: security-advisories@github.com
  - url: >-
      https://github.com/discourse/discourse/security/advisories/GHSA-wmc6-pmxp-xw5w
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00378
epssPercentile: 0.28982
ingestedAt: '2026-09-18T20:51:25.621Z'
---

## Overview

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.1, on sites with category group moderation enabled, the review queue could include an excerpt (and permalink) of the private message attached to a flag, even when the reviewing category moderator was not a participant in that message. These notify_moderators flag messages are addressed only to moderators and, for core flags, to a category's moderation groups as they existed when the flag was raised, so a category group moderator could read flag-discussion content they were not authorized to see. This affects official plugins that create such messages and core flags raised before a moderator's group was granted moderation of the category. Only the confidentiality of a limited excerpt of these flag-related private messages is affected; no content can be modified or deleted. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.1.

## Remediation

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