CVE-2026-44786

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

State: Published
Severity: 7.5 High
Published: Jun 12, 2026
Updated: Jun 15, 2026
Reserved: May 7, 2026

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.

Scores

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

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

Affected Products

Product	Versions
discoursediscourse	>= 2026.1.0-latest, < 2026.1.4Affected >= 2026.3.0-latest, < 2026.3.1Affected >= 2026.4.0-latest, < 2026.4.1Affected

References

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

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