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

Quick assessment

Affected
discourse discourse
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Discourse是Discourse社区开源的一套开源的社区讨论平台。 该平台包括社区、电子邮件和聊天室等功能。 Discourse 2026.1.0-latest至2026.1.4之前版本、2026.3.0-latest至2026.3.1之前版本和2026.4.0-latest至2026.4.1之前版本存在信息泄露漏洞，该漏洞源于公共分类频道的聊天事件发布到MessageBus时未进行权限范围限制，可能导致任何未启用聊天的MessageBus订阅者实时接收聊天消息有效载荷。

CVSS 7.5 · High EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1115 · Clipboard Data

Affected Version Matrix 3

VendorProduct Version RangeStatus
discourse discourse >= 2026.1.0-latest, < 2026.1.4 affected
>= 2026.3.0-latest, < 2026.3.1 affected
>= 2026.4.0-latest, < 2026.4.1 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Discourse 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Discourse是Discourse社区开源的一套开源的社区讨论平台。 该平台包括社区、电子邮件和聊天室等功能。 Discourse 2026.1.0-latest至2026.1.4之前版本、2026.3.0-latest至2026.3.1之前版本和2026.4.0-latest至2026.4.1之前版本存在信息泄露漏洞，该漏洞源于公共分类频道的聊天事件发布到MessageBus时未进行权限范围限制，可能导致任何未启用聊天的MessageBus订阅者实时接收聊天消息有效载荷。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
discourse discourse >= 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-2026-45775 6.8 MEDIUM Discourse: Cross-site backup access via path traversal in multisite local backups
CVE-2026-44784 6.5 MEDIUM Discourse: Non-staff group owners can see email password in plaintext through group histor
CVE-2026-44783 5.4 MEDIUM Discourse: Replying to a whisper lets non-whisperers create staff-only whisper posts
CVE-2026-45085 5.3 MEDIUM Discourse: Chat misauthorization and information disclosure
CVE-2026-47264 5.3 MEDIUM Discourse: Don't leak restricted tag group names via tag info
CVE-2026-47263 4.3 MEDIUM Discourse: Prevent webhook payload disclosure on event redelivery
CVE-2026-44779 4.3 MEDIUM Discourse: Bot debug endpoints disclose whisper translation audit logs
CVE-2026-44780 4.3 MEDIUM Discourse: Category queue reviewers can read raw incoming emails from queued posts
CVE-2026-44782 4.3 MEDIUM Discourse: GroupPostSerializer leaks hidden full names through reaction post association
CVE-2026-44785 4.3 MEDIUM Discourse: 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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