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CVE-2026-33423— Discourse staff can modify any user's group notification level

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 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，该漏洞源于工作人员可以修改任何用户的群组通知级别，可能导致权限提升。

AI Predicted 6.5 Difficulty: Easy EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1548.001 · Setuid and Setgid
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I. Basic Information for CVE-2026-33423

Vulnerability Information
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Vulnerability Title
Discourse staff can modify any user's group notification level
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, staff can modify any user's group notification level. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
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，该漏洞源于工作人员可以修改任何用户的群组通知级别，可能导致权限提升。
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, < 2026.1.2 -

II. Public POCs for CVE-2026-33423

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III. Intelligence Information for CVE-2026-33423

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Vendor Advisories for CVE-2026-33423 (1)

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

CVE-2026-33424 5.9 MEDIUM PM access granted through invites after access revocation
CVE-2026-33411 5.4 MEDIUM Discourse's solved topic stream has potential stored XSS in topic title
CVE-2026-33251 5.4 MEDIUM Discourse has a Hidden Solved topics permission bypass
CVE-2026-31805 5.3 MEDIUM Discourse has a poll authorization bypass via post_id array parameter
CVE-2026-33422 3.5 LOW Discourse exposes ip_address of flagged user
CVE-2026-33426 3.5 LOW Discourse users can edit or synonymize hidden tags they can't see
CVE-2026-30888 2.2 LOW Discourse has moderator privilege escalation via arbitrary post_id in suspend/silence endp
CVE-2026-31869 Discourse: Composer mentions endpoint leaks hidden group membership through PM `allowed_na
CVE-2026-30889 Discourse has Unauthorized Post Data Exposure in discourse-user-notes
CVE-2026-30891 Discourse hasUnauthorized Exposure of Private User Action Types
CVE-2026-32114 Discourse's unscoped status lookups leak restricted metadata
CVE-2026-33291 Discourse user can create Zendesk tickets even when it does not have access to topic
CVE-2026-33425 Discourse has inferable private group membership or existence via exclude_groups parameter
CVE-2026-33427 Discourse Authorization Page Displays Unvalidated Redirect Domain
CVE-2026-33428 Discourse Allows Unauthorized Access to Deleted Posts Index via Group Membership

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-33423

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