CVE-2026-44786

HIGH

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

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 7.5
EPSS 0.0024
EPSS Percentile 15.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-200
Status published
Products (3)
discourse/discourse >= 2026.1.0-latest, < 2026.1.4
discourse/discourse >= 2026.3.0-latest, < 2026.3.1
discourse/discourse >= 2026.4.0-latest, < 2026.4.1
Published Jun 12, 2026
Tracked Since Jun 13, 2026