Access Control Flaw in Discourse Open-Source Discussion Platform
CVE-2026-72722

4.3MEDIUM

Key Information:

Vendor

Discourse
Status
Discourse
Vendor
CVE Published:
10 August 2026

What is CVE-2026-72722?

An access control vulnerability in the Discourse discussion platform allows authenticated users to bypass restrictions on private content. Prior to the patches provided in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, certain functions responsible for processing internal links failed to properly enforce visibility checks. As a result, users could obtain canonicalized slugs or titles from restricted topics and hidden posts, posing a risk of unauthorized information disclosure. Discourse has addressed this issue in the latest updates.

Affected Version(s)

discourse < 2026.1.6 < 2026.1.6

discourse >= 2026.5.0-latest, < 2026.5.2 < 2026.5.0-latest, 2026.5.2

discourse >= 2026.6.0-latest, < 2026.6.1 < 2026.6.0-latest, 2026.6.1

References

https://github.com/discourse/discourse/security/advisorie...
x_refsource_CONFIRM
https://github.com/discourse/discourse/pull/42091
x_refsource_MISC
https://github.com/discourse/discourse/pull/42092
x_refsource_MISC

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.