CVE-2026-72722
Received
Received - Intake
Information Disclosure in Discourse
Vulnerability report for CVE-2026-72722, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-08-10
Last updated on: 2026-08-10
Assigner: GitHub, Inc.
Description
Description
Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, TopicLink.extract_from, TopicLink.ensure_entry_for, and TopicLink.duplicate_lookup do not consistently enforce Guardian.can_see? checks when processing internal links. An authenticated user can submit links to restricted topics, private messages, or hidden posts and receive canonicalized slugs or titles in the composer_messages duplicate_lookup response even though the targets are not visible to that user. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| discourse | discourse | 2026.1.6 |
| discourse | discourse | 2026.5.2 |
| discourse | discourse | 2026.6.1 |
| discourse | discourse | 2026.7.0 |
| discourse | discourse | to 2026.1.6 (exc) |
| discourse | discourse | to 2026.5.2 (exc) |
| discourse | discourse | to 2026.6.1 (exc) |
| discourse | discourse | to 2026.7.0 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-862 | The product does not perform an authorization check when an actor attempts to access a resource or perform an action. |
