CVE-2026-44786

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

HIGH

7.5

CVSS Score

Published: June 12, 2026 at 08:22 PM UTC

Updated: June 17, 2026 at 09:18 PM UTC

1 product affected across 1 vendorDiscourse

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Severity

HIGH7.5

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Discourse · Discourse

95%

v < 2026.1.0v < 2026.1.4v < 2026.3.1v < 2026.4.12026.1.0 ≤ v < 2026.1.42026.3.0 ≤ v < 2026.3.12026.4.0 ≤ v < 2026.4.12026.5.0

Affected range stops below 2026.1.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 2026.1.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 2026.3.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 2026.4.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_CONFIRMThird Party Advisory

Source: cverecord

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

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHGitHub_M

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-200

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