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CVE-2026-46413— Discourse: Regular users can route multipart uploads into the admin backup store

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 2026.1.5之前版本和2026.4.2之前版本和2026.5.1之前版本和2026.6.0之前版本存在授权问题漏洞，该漏洞源于授权问题（CWE-862），可能导致普通用户通过ExternalUploadManager将直接S3分块上传路由到管理员备份存储。

CVSS 6.5 · Medium EPSS 0.51% · P41

Affected Version Matrix 3

VendorProduct Version RangeStatus
discourse discourse >= 2026.1.0-latest, < 2026.1.5 affected
>= 2026.4.0-latest, < 2026.4.2 affected
>= 2026.5.0-latest, < 2026.5.1 affected
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I. Basic Information for CVE-2026-46413

Vulnerability Information
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Vulnerability Title
Discourse: Regular users can route multipart uploads into the admin backup store
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, regular users could route direct S3 multipart uploads through ExternalUploadManager into the admin backup store. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Discourse 授权问题漏洞
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 2026.1.5之前版本和2026.4.2之前版本和2026.5.1之前版本和2026.6.0之前版本存在授权问题漏洞，该漏洞源于授权问题（CWE-862），可能导致普通用户通过ExternalUploadManager将直接S3分块上传路由到管理员备份存储。
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, < 2026.1.5 -

II. Public POCs for CVE-2026-46413

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III. Intelligence Information for CVE-2026-46413

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Patches & Fixes for CVE-2026-46413 (4)

Vendor Advisories for CVE-2026-46413 (1)

Vendor Pages for CVE-2026-46413 (4)

Same Patch Batch · discourse · 2026-07-09 · 11 CVEs total

CVE-2026-44787 8.2 HIGH Discourse: Signup-time primary_group_id assignment grants whisperer access
CVE-2026-55420 7.5 HIGH Discourse: Remote code execution via pdf uploads
CVE-2026-53963 7.3 HIGH Discourse: Stored-XSS in 2FA delete confirmation modal
CVE-2026-53961 6.5 MEDIUM Discourse: Forged AWS SNS bounce notifications can disable a targeted user's email (missin
CVE-2026-53962 5.4 MEDIUM Discourse: Insufficient SVG sanitization logic
CVE-2026-45780 5.3 MEDIUM Discourse: Private event sample invitees are serialized to non-invited event viewers
CVE-2026-59828 5.3 MEDIUM Discourse: Hidden post revisions leak through adjacent visible diffs
CVE-2026-45788 Discourse: Secure uploads exposed by hotlinked image copying
CVE-2026-49256 Discourse: Hidden tag names leaked via category serializers
CVE-2026-55424 Discourse: Topic featured link susceptible to stored XSS

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-862

V. Comments for CVE-2026-46413

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