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CVE-2026-47263— Discourse: Prevent webhook payload disclosure on event redelivery

CVSS 4.3 · Medium EPSS 0.18% · P8

Possible ATT&CK Techniques 1AI

T1005 · Data from Local System

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-2026-47263

Vulnerability Information
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Vulnerability Title
Discourse: Prevent webhook payload disclosure on event redelivery
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, the MessageBus.publish call for /web_hook_events/<id> in Jobs::RedeliverWebHookEvents did not pass group_ids, leaving the channel readable by any authenticated user (or anonymous user on instances where login_required is disabled). Webhook IDs are sequential integers and trivially enumerable. 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:R/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
信息暴露
Source: NVD (National Vulnerability Database)
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Jobs::RedeliverWebHookEvents中的MessageBus.publish调用未传递group_ids，导致任意认证用户（或登录被禁用的匿名用户）可读取
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

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

II. Public POCs for CVE-2026-47263

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III. Intelligence Information for CVE-2026-47263

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Vendor Advisories for CVE-2026-47263 (1)

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

CVE-2026-447867.5 HIGHDiscourse: Public chat MessageBus broadcasts are not restricted to chat-eligible users
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-2026-447794.3 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-2026-47263

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