CVE-2026-33411

MEDIUM
2026-03-20 GitHub_M
5.4
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

2
Analysis Generated
Mar 20, 2026 - 23:16 vuln.today
CVE Published
Mar 20, 2026 - 22:58 nvd
MEDIUM 5.4

Tags

XSS

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.

Analysis

A stored cross-site scripting (XSS) vulnerability exists in Discourse's solved posts stream feature where unsanitized topic titles can be persisted and executed in the browser context of authenticated users. The vulnerability affects Discourse versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, allowing authenticated attackers to inject malicious JavaScript that executes in the browsers of other users viewing the affected topics. …

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Remediation

Within 30 days: Identify affected systems running topic titles for the solved posts stream. and apply vendor patches as part of regular patch cycle. …

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Priority Score

27
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +27
POC: 0

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CVE-2026-33411 vulnerability details – vuln.today
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