CVE-2026-44786 PUBLISHED

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

Assigner: GitHub_M
Reserved: 07.05.2026 Published: 12.06.2026 Updated: 12.06.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS Score: 7.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	discourse
Product	discourse
Versions	Version >= 2026.1.0-latest, < 2026.1.4 is affected Version >= 2026.3.0-latest, < 2026.3.1 is affected Version >= 2026.4.0-latest, < 2026.4.1 is affected

References

https://github.com/discourse/discourse/security/advisories/GHSA-j7wq-rf5c-8783

Problem Types

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor CWE