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CVE-2026-33425— Discourse has inferable private group membership or existence via exclude_groups parameter

EPSS 0.06% · P18
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I. Basic Information for CVE-2026-33425

Vulnerability Information
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Vulnerability Title
Discourse has inferable private group membership or existence via exclude_groups parameter
Source: NVD (National Vulnerability Database)
Vulnerability Description
Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, unauthenticated users can determine whether a specific user is a member of a private group by observing changes in directory results when using the `exclude_groups` parameter. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, disable public access to the user directory via Admin → Settings → hide user profiles from public.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过差异性导致的信息暴露
Source: NVD (National Vulnerability Database)
Vulnerability Title
Discourse 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Discourse是Discourse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 2026.3.0-latest.1之前版本、2026.2.1之前版本和2026.1.2之前版本存在安全漏洞，该漏洞源于未经验证的用户可通过观察使用exclude_groups参数时目录结果的变化来确定特定用户是否为私有群组成员，可能导致信息泄露。
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, < 2026.1.2 -

II. Public POCs for CVE-2026-33425

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III. Intelligence Information for CVE-2026-33425

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Same Patch Batch · discourse · 2026-03-20 · 16 CVEs total

CVE-2026-334245.9 MEDIUMPM access granted through invites after access revocation
CVE-2026-334115.4 MEDIUMDiscourse's solved topic stream has potential stored XSS in topic title
CVE-2026-332515.4 MEDIUMDiscourse has a Hidden Solved topics permission bypass
CVE-2026-318055.3 MEDIUMDiscourse has a poll authorization bypass via post_id array parameter
CVE-2026-334223.5 LOWDiscourse exposes ip_address of flagged user
CVE-2026-334263.5 LOWDiscourse users can edit or synonymize hidden tags they can't see
CVE-2026-308882.2 LOWDiscourse has moderator privilege escalation via arbitrary post_id in suspend/silence endp
CVE-2026-31869Discourse: Composer mentions endpoint leaks hidden group membership through PM `allowed_na
CVE-2026-30889Discourse has Unauthorized Post Data Exposure in discourse-user-notes
CVE-2026-30891Discourse hasUnauthorized Exposure of Private User Action Types
CVE-2026-32114Discourse's unscoped status lookups leak restricted metadata
CVE-2026-33291Discourse user can create Zendesk tickets even when it does not have access to topic
CVE-2026-33423Discourse staff can modify any user's group notification level
CVE-2026-33427Discourse Authorization Page Displays Unvalidated Redirect Domain
CVE-2026-33428Discourse Allows Unauthorized Access to Deleted Posts Index via Group Membership

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-203

V. Comments for CVE-2026-33425

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