---
id: CVE-2026-91157
title: Discourse is an open-source discussion platform
summary: >-
  Discourse is an open-source discussion platform. Prior to 2026.9.0, 2026.8.1,
  2026.7.3, and 2026.1.9, sites with secure uploads enabled did not reconcile
  existing upload security metadata when a previously public category became
  read-res…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-200
  - CWE-863
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T16:17:56.583'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91157'
references:
  - url: >-
      https://github.com/discourse/discourse/commit/16017732981fdb3ee65d7b3c69c573610bf02aab
    label: security-advisories@github.com
  - url: >-
      https://github.com/discourse/discourse/commit/83f5f9f1df7ddc79ec0950e1b2038ba659635708
    label: security-advisories@github.com
  - url: >-
      https://github.com/discourse/discourse/commit/98f1c021d0e956cded5239a5d8a6afe2b9e1b7e7
    label: security-advisories@github.com
  - url: >-
      https://github.com/discourse/discourse/commit/b2fb98394b2636b29e850f06b0029f8ca8b48458
    label: security-advisories@github.com
  - url: >-
      https://github.com/discourse/discourse/security/advisories/GHSA-298h-xgw6-4pv3
    label: security-advisories@github.com
tags:
  - nvd
ingestedAt: '2026-10-14T16:40:32.133Z'
---

## Overview

Discourse is an open-source discussion platform. Prior to 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9, sites with secure uploads enabled did not reconcile existing upload security metadata when a previously public category became read-restricted or when category permissions changed during a bulk import. Media and attachments uploaded while the category was public retained a public accessibility flag and remained reachable by anonymous users through their short upload URLs, including uploads associated with deleted topics. This issue is fixed in versions 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9.

## Remediation

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