CVE-2026-44786 Discourse: Public chat MessageBus broadcasts are not restricted to chat-eligible users

What is CVE-2026-44786?

CVE-2026-44786 is a high-severity vulnerability in Discourse Discourse, published on 12 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, chat events for public category channels are published to MessageBus without permission scoping, so any MessageBus subscriber without chat enabled could receive chat message payloads in real time. This issue has been patched in versions 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1.

Weakness: CWE-200

Which versions are affected by CVE-2026-44786?

1 open source package ship an affected version, including discourse. It affects 1 product.

Products include Discourse Discourse.

How do I fix CVE-2026-44786?

Upgrade discourse to a fixed version for your release line: 2026.1.4, 2026.3.1 or 2026.4.1.

Is CVE-2026-44786 being exploited?

There is no known exploitation of CVE-2026-44786 in the wild and no public exploit code.

Other vulnerabilities in Discourse Discourse

• CVE-2021-41163 RCE via malicious SNS subscription payload Critical 10.0
• CVE-2022-36066 Discourse vulnerable to RCE via admins uploading maliciously zipped file Critical 9.1
• CVE-2022-39356 Discourse user account takeover via email and invite link High 8.9
• CVE-2023-22468 Discourse vulnerable to Cross-site Scripting in local oneboxes High 8.8
• CVE-2026-27934 Discourse leaks private topic title and post excerpt via user action API endpoint High 8.7

All Discourse Discourse vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-discourse-2026-44786, GHSA-j7wq-rf5c-8783.