CVE-2026-26077— Discourse doesn't ensure webhooks require a token
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I. Basic Information for CVE-2026-26077
Vulnerability Information
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Vulnerability Title
Discourse doesn't ensure webhooks require a token
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, several webhook endpoints (SendGrid, Mailjet, Mandrill, Postmark, SparkPost) in the `WebhooksController` accepted requests without a valid authentication token when no token was configured. This allowed unauthenticated attackers to forge webhook payloads and artificially inflate user bounce scores, potentially causing legitimate user emails to be disabled. The Mailpace endpoint had no token validation at all. Starting in versions 2025.12.2, 2026.1.1, and 2026.2.0, all webhook endpoints reject requests with a 406 response when no authentication token is configured. As a workaround, ensure that webhook authentication tokens are configured for all email provider integrations in site settings (e.g., `sendgrid_verification_key`, `mailjet_webhook_token`, `postmark_webhook_token`, `sparkpost_webhook_token`). There's no current workaround for mailpace before getting this fix.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证机制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Discourse 授权问题漏洞
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之前版本存在授权问题漏洞，该漏洞源于多个Webhook端点缺少身份验证令牌验证，可能导致未经验证的攻击者伪造Webhook有效载荷。
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-2026-26077
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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-2026-26207 | 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-2026-27021 | 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
- 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-287
- CVE-2026-8244
Industrial Application Software IAS Canias ERP Login RMI imp - CVE-2026-8216
Industrial Application Software IAS Canias ERP Java RMI Sess - CVE-2026-8214
Industrial Application Software IAS Canias ERP RMI doAction - CVE-2026-42560
auth: Patreon provider assigns the same local user ID to eve - CVE-2026-41070
openvpn-auth-oauth2 returns FUNC_SUCCESS on client-deny, all
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