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CVE-2026-33411— Discourse's solved topic stream has potential stored XSS in topic title

CVSS 5.4 · Medium EPSS 0.01% · P2
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I. Basic Information for CVE-2026-33411

Vulnerability Information
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Vulnerability Title
Discourse's solved topic stream has potential stored XSS in topic title
Source: NVD (National Vulnerability Database)
Vulnerability Description
Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a potential stored XSS in topic titles for the solved posts stream. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, ensure that the Content Security Policy is enabled, and has not been modified in a way which would make it more vulnerable to XSS attacks.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Discourse 跨站脚本漏洞
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之前版本存在跨站脚本漏洞，该漏洞源于已解决帖子流中的主题标题处理不当，可能导致存储型跨站脚本攻击。
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

VendorProductAffected VersionsCPESubscribe
discoursediscourse >= 2026.1.0-latest, < 2026.1.2 -

II. Public POCs for CVE-2026-33411

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III. Intelligence Information for CVE-2026-33411

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

CVE-2026-334245.9 MEDIUMPM access granted through invites after access revocation
CVE-2026-332515.4 MEDIUMDiscourse has a Hidden Solved topics permission bypass
CVE-2026-318055.3 MEDIUMDiscourse has a poll authorization bypass via post_id array parameter
CVE-2026-334223.5 LOWDiscourse exposes ip_address of flagged user
CVE-2026-334263.5 LOWDiscourse users can edit or synonymize hidden tags they can't see
CVE-2026-308882.2 LOWDiscourse has moderator privilege escalation via arbitrary post_id in suspend/silence endp
CVE-2026-31869Discourse: Composer mentions endpoint leaks hidden group membership through PM `allowed_na
CVE-2026-30889Discourse has Unauthorized Post Data Exposure in discourse-user-notes
CVE-2026-30891Discourse hasUnauthorized Exposure of Private User Action Types
CVE-2026-32114Discourse's unscoped status lookups leak restricted metadata
CVE-2026-33291Discourse user can create Zendesk tickets even when it does not have access to topic
CVE-2026-33423Discourse staff can modify any user's group notification level
CVE-2026-33425Discourse has inferable private group membership or existence via exclude_groups parameter
CVE-2026-33427Discourse Authorization Page Displays Unvalidated Redirect Domain
CVE-2026-33428Discourse Allows Unauthorized Access to Deleted Posts Index via Group Membership

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-79

V. Comments for CVE-2026-33411

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