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CVE-2026-44787— Discourse: Signup-time primary_group_id assignment grants whisperer access

CVSS 8.2 · High EPSS 0.27% · P19

Possible ATT&CK Techniques 1AI

T1136.001 · Local Account

Affected Version Matrix 3

VendorProductVersion RangeStatus
discoursediscourse>= 2026.1.0-latest, < 2026.1.5affected
>= 2026.4.0-latest, < 2026.4.2affected
>= 2026.5.0-latest, < 2026.5.1affected
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I. Basic Information for CVE-2026-44787

Vulnerability Information
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Vulnerability Title
Discourse: Signup-time primary_group_id assignment grants whisperer access
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, the signup flow could allow newly registered users to set primary_group_id and gain whisper-group privileges without legitimate group membership on sites with whispers_allowed_groups configured. 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:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Discourse 权限许可和访问控制问题漏洞
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存在权限许可和访问控制问题漏洞，该漏洞源于注册流程问题，可能导致新注册用户在配置了whisper_allowed_groups的站点上设置primary_group_id并获取whisper-group权限，而无需合法群组成员资格。以下版本受到影响：2026.1.5之前版本、2026.4.2之前版本、2026.5.1之前版本和2026.6.0之前版本。
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, < 2026.1.5 -

II. Public POCs for CVE-2026-44787

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III. Intelligence Information for CVE-2026-44787

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Patches & Fixes for CVE-2026-44787 (4)

Vendor Advisories for CVE-2026-44787 (1)

Vendor Pages for CVE-2026-44787 (4)

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

CVE-2026-554207.5 HIGHDiscourse: Remote code execution via pdf uploads
CVE-2026-539637.3 HIGHDiscourse: Stored-XSS in 2FA delete confirmation modal
CVE-2026-539616.5 MEDIUMDiscourse: Forged AWS SNS bounce notifications can disable a targeted user's email (missin
CVE-2026-464136.5 MEDIUMDiscourse: Regular users can route multipart uploads into the admin backup store
CVE-2026-539625.4 MEDIUMDiscourse: Insufficient SVG sanitization logic
CVE-2026-457805.3 MEDIUMDiscourse: Private event sample invitees are serialized to non-invited event viewers
CVE-2026-598285.3 MEDIUMDiscourse: Hidden post revisions leak through adjacent visible diffs
CVE-2026-45788Discourse: Secure uploads exposed by hotlinked image copying
CVE-2026-49256Discourse: Hidden tag names leaked via category serializers
CVE-2026-55424Discourse: Topic featured link susceptible to stored XSS

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-269

V. Comments for CVE-2026-44787

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