CyberRota Analysis
AI-GeneratedThe vulnerability affects the video placeholder component of the Discourse platform, allowing authenticated users to inject malicious JavaScript through crafted HTML. This could lead to arbitrary code execution in the context of other users' sessions, particularly in environments where Content Security Policy settings are disabled or relaxed. Organizations using affected versions of Discourse should prioritize upgrading to the patched versions to mitigate the risk of session hijacking and unauthorized data access.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, the video placeholder component allowed crafted HTML to cause an attribute breakout and inject an attacker-controlled event handler. An authenticated user with default trust-level posting privileges could store the crafted placeholder in a post. When another user opened the post and clicked the video play overlay, the handler could execute arbitrary JavaScript in the viewer's session. Default Content Security Policy settings block inline event handlers, but instances with CSP disabled or relaxed could allow the script to read page content and make authenticated requests as the viewer. This issue is fixed in versions 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0.