CVE-2026-27021— Discourse: Poll voters endpoint lacked post visibility checks
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I. Basic Information for CVE-2026-27021
Vulnerability Information
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Vulnerability Title
Discourse: Poll voters endpoint lacked post visibility checks
Source: NVD (National Vulnerability Database)
Vulnerability Description
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, the voters endpoint in the poll plugin lacked post visibility checks which allowed unauthorized access to voters details of polls in any post. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制缺失
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 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，该漏洞源于投票插件中缺少帖子可见性检查，可能导致未授权访问投票者详情。
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
II. Public POCs for CVE-2026-27021
| # | POC Description | Source Link | Shenlong Link |
|---|
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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-2026-28219 | Privilege Escalation via Mass Assignment Allows Regular Users to Set Topics as Global Bann | |
| 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-2026-26979 | Discourse: TL4 users are able to change status of restricted topics |
IV. Related Vulnerabilities
Same product: discourse
- CVE-2026-34947
Discourse: Staged user custom fields are exposed on public i - CVE-2026-27481
Discourse: Hidden tag visibility bypass on tag routes - CVE-2026-33415
Discourse: Improper Access Control in discourse-ai Allows Un - CVE-2026-33300
Discourse: Hidden group names and access metadata are expose - CVE-2026-33185
Discourse: Group SMTP test endpoint susceptible to SSRF
Same vendor: discourse
- CVE-2026-34947
Discourse: Staged user custom fields are exposed on public i - CVE-2026-27481
Discourse: Hidden tag visibility bypass on tag routes - CVE-2026-33415
Discourse: Improper Access Control in discourse-ai Allows Un - CVE-2026-33300
Discourse: Hidden group names and access metadata are expose - CVE-2026-33185
Discourse: Group SMTP test endpoint susceptible to SSRF
Same weakness: CWE-862
- CVE-2021-47932
WordPress TheCartPress 1.5.3.6 Privilege Escalation Unauthen - CVE-2025-15634
HCL BigFix WebUI is affected by a missing authorization vuln - CVE-2026-42297
Argo Workflows Is Missing Authorization in Sync ConfigMap Pr - CVE-2026-42174
Kirby: User avatar creation, replacement and deletion are no - CVE-2026-42137
Kirby: `pages.access/list` and `files.access/list` permissio
V. Comments for CVE-2026-27021
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