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CVE-2026-33300— Discourse: Hidden group names and access metadata are exposed to moderators through the `category-chatables` endpoint

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存在信息泄露漏洞，该漏洞源于Category Chatables Controller show操作存在授权绕过问题，可能导致版主获取隐藏群组名称和用户数量信息。以下版本受到影响：2026.1.3之前版本、2026.2.2之前版本和2026.3.0之前版本。

AI Predicted 5.3 Difficulty: Easy EPSS 0.40% · P32
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I. Basic Information for CVE-2026-33300

Vulnerability Information
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Vulnerability Title
Discourse: Hidden group names and access metadata are exposed to moderators through the `category-chatables` endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, an authorization bypass in the Category Chatables Controller show action allowed moderators to get information on hidden groups names and user count. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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存在信息泄露漏洞，该漏洞源于Category Chatables Controller show操作存在授权绕过问题，可能导致版主获取隐藏群组名称和用户数量信息。以下版本受到影响：2026.1.3之前版本、2026.2.2之前版本和2026.3.0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

Vendor Product Affected Versions CPE Subscribe
discourse discourse >= 2026.1.0-latest, < 2026.1.3 -

II. Public POCs for CVE-2026-33300

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III. Intelligence Information for CVE-2026-33300

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Patches & Fixes for CVE-2026-33300 (1)

Vendor Advisories for CVE-2026-33300 (1)

Same Patch Batch · discourse · 2026-03-31 · 15 CVEs total

CVE-2026-32273 5.4 MEDIUM Discourse: XSS on category description update via API
CVE-2026-32618 4.3 MEDIUM Discourse: Unauthorized channel membership inference via excluded_memberships_channel_id
CVE-2026-32951 4.3 MEDIUM Discourse: Authorization bypass in oneboxer via user-controlled category id
CVE-2026-32113 Discourse: Open redirect via `sso_destination_url` cookie in `enter`
CVE-2026-32607 Discourse: Stored XSS via unescaped assignee name
CVE-2026-32620 Discourse: Missing post-level authorization allows whisper metadata disclosure
CVE-2026-32619 Discourse: Insufficient topic visibility check allows unauthorized poll manipulation in pr
CVE-2026-32243 Discourse: Stored XSS in discourse-ai shared conversations onebox
CVE-2026-32615 Discourse: Category group moderators can perform actions on topics in restricted categorie
CVE-2026-32143 Discourse: Admin-only report can be exported by moderators
CVE-2026-33074 Discourse: Vulnerability in discourse-subscriptions plugin allowing users to self-grant to
CVE-2026-33073 discourse-subscriptions plugin leaking stripe API key in multisite environment
CVE-2026-33415 Discourse: Improper Access Control in discourse-ai Allows Unauthorized Category Content Ex
CVE-2026-33185 Discourse: Group SMTP test endpoint susceptible to SSRF

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-200

V. Comments for CVE-2026-33300

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