Access Control Bypass Affecting chainlit package, versions [,2.8.5)
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- published4 Dec 2025
- disclosed2 Dec 2025
- creditUnknown
Introduced: 2 Dec 2025
New CVE NOT AVAILABLE CWE-284 (opens in a new tab)Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade chainlit to version 2.8.5 or higher.
Overview
chainlit is a Build Conversational AI.
Affected versions of this package are vulnerable to Access Control Bypass due to a missing authorization check when binding a WebSocket session to a user-supplied threadId. An attacker can exploit this weakness by providing an arbitrary threadId, allowing them to associate their WebSocket connection with threads they do not own. This can expose conversation data or enable unauthorized interaction with resources tied to that thread.