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CVE-2026-28219— Privilege Escalation via Mass Assignment Allows Regular Users to Set Topics as Global Banners

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 2025.12.2之前版本、2026.1.1之前版本和2026.2.0之前版本存在安全漏洞，该漏洞源于主题管理逻辑中授权检查不当，允许用户修改主题的特权属性，可能导致权限提升。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.36% · P27

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-28219

Vulnerability Information
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Vulnerability Title
Privilege Escalation via Mass Assignment Allows Regular Users to Set Topics as Global Banners
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, an improper authorization check in the topic management logic allows authenticated users to modify privileged attributes of their topics. By manipulating specific parameters in a PUT or POST request, a regular user can elevate a topic’s status to a site-wide notice or banner, bypassing intended administrative restrictions. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. There are no practical workarounds to prevent this behavior other than applying the security patch. Administrators concerned about unauthorized promotions should audit recent changes to site banners and global notices until the fix is deployed.
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
CWE-915
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 2025.12.2之前版本、2026.1.1之前版本和2026.2.0之前版本存在安全漏洞，该漏洞源于主题管理逻辑中授权检查不当，允许用户修改主题的特权属性，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 < 2025.12.2 -

II. Public POCs for CVE-2026-28219

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III. Intelligence Information for CVE-2026-28219

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Vendor Advisories for CVE-2026-28219 (1)

Same Patch Batch · discourse · 2026-02-26 · 17 CVEs total

CVE-2026-26265 7.5 HIGH Discourse has IDOR vulnerability in the directory items endpoint
CVE-2026-26078 7.5 HIGH Discourse has authentication bypass vulnerability in the Patreon plugin webhook endpoint
CVE-2026-26077 6.5 MEDIUM Discourse doesn't ensure webhooks require a token
CVE-2026-26207 5.4 MEDIUM DIscourse's discourse-policy plugin lacks post access check
CVE-2026-26973 4.3 MEDIUM Discourse doesn't scope reviewable notes to user-visible reviewables
CVE-2026-28227 Discourse Vulnerable to Unauthorized Topic Creation in Staff-Only Categories via Topic Tim
CVE-2026-28218 Discourse's Fail-Open Access Control in Data Explorer Plugin Allows Unauthorized SQL Query
CVE-2026-27154 Discourse has XSS when editing a malicious post
CVE-2026-27153 Discourse doesn't prevent moderators from exporting user Chat DMs
CVE-2026-27152 DIscourse has DM communication-preference bypass when adding members
CVE-2026-27162 DIscourse doesn't prevent whispers to leak in excerpts
CVE-2026-27151 Discourse doesn't validate destination topic when moving posts
CVE-2026-27150 Discourse doesn't ensure guardian check when creating QueryGroupBookmark
CVE-2026-27149 Discourse has SQL injection in PM tag filtering
CVE-2026-27021 Discourse: Poll voters endpoint lacked post visibility checks
CVE-2026-26979 Discourse: TL4 users are able to change status of restricted topics

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-915

V. Comments for CVE-2026-28219

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