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

CVSS 7.5 · High EPSS 0.24% · P15

Possible ATT&CK Techniques 1AI

T1115 · Clipboard Data

Affected Version Matrix 3

VendorProductVersion RangeStatus
discoursediscourse>= 2026.1.0-latest, < 2026.1.4affected
>= 2026.3.0-latest, < 2026.3.1affected
>= 2026.4.0-latest, < 2026.4.1affected
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I. Basic Information for CVE-2026-44786

Vulnerability Information
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Vulnerability Title
Discourse: Public chat MessageBus broadcasts are not restricted to chat-eligible users
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
信息暴露
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
discoursediscourse >= 2026.1.0-latest, < 2026.1.4 -

II. Public POCs for CVE-2026-44786

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III. Intelligence Information for CVE-2026-44786

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Vendor Advisories for CVE-2026-44786 (1)

Same Patch Batch · discourse · 2026-06-12 · 11 CVEs total

CVE-2026-457756.8 MEDIUMDiscourse: Cross-site backup access via path traversal in multisite local backups
CVE-2026-447846.5 MEDIUMDiscourse: Non-staff group owners can see email password in plaintext through group histor
CVE-2026-447835.4 MEDIUMDiscourse: Replying to a whisper lets non-whisperers create staff-only whisper posts
CVE-2026-450855.3 MEDIUMDiscourse: Chat misauthorization and information disclosure
CVE-2026-472645.3 MEDIUMDiscourse: Don't leak restricted tag group names via tag info
CVE-2026-472634.3 MEDIUMDiscourse: Prevent webhook payload disclosure on event redelivery
CVE-2026-447794.3 MEDIUMDiscourse: Bot debug endpoints disclose whisper translation audit logs
CVE-2026-447804.3 MEDIUMDiscourse: Category queue reviewers can read raw incoming emails from queued posts
CVE-2026-447824.3 MEDIUMDiscourse: GroupPostSerializer leaks hidden full names through reaction post association
CVE-2026-447854.3 MEDIUMDiscourse: Hidden reply-to post raw can be disclosed through AI explain prompts

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-200

V. Comments for CVE-2026-44786

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