CVE-2026-24399 in chat
Summary
by MITRE • 01/24/2026
ChatterMate is a no-code AI chatbot agent framework. In versions 1.0.8 and below, the chatbot accepts and executes malicious HTML/JavaScript payloads when supplied as chat input. Specifically, an <iframe> payload containing a javascript: URI can be processed and executed in the browser context. This allows access to sensitive client-side data such as localStorage tokens and cookies, resulting in client-side injection. This issue has been fixed in version 1.0.9.
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Analysis
by VulDB Data Team • 02/12/2026
CVE-2026-24399 represents a critical client-side code injection vulnerability within the ChatterMate no-code AI chatbot framework affecting versions 1.0.8 and earlier. This vulnerability stems from inadequate input sanitization mechanisms that fail to properly validate and escape user-provided content before rendering it within the browser environment. The flaw specifically manifests when the chatbot processes malicious HTML payloads containing iframe elements with javascript: URIs, creating a direct pathway for attackers to execute arbitrary code in the context of the user's browser session.
The technical exploitation of this vulnerability follows a well-established pattern of cross-site scripting attacks that leverage the browser's trust in locally executed content. When a user submits a malicious payload containing an iframe with a javascript: URI, the framework's insufficient sanitization allows this content to be rendered directly in the browser without proper security controls. This creates a dangerous execution environment where the injected JavaScript code can access the full browser context, including sensitive localStorage tokens, cookies, and other client-side authentication mechanisms. The vulnerability maps directly to CWE-79 - Cross-site Scripting and aligns with ATT&CK technique T1059.007 for JavaScript execution within the browser environment.
The operational impact of this vulnerability extends beyond simple data theft, as successful exploitation can lead to complete session hijacking and unauthorized access to protected resources. Attackers can leverage this vulnerability to steal authentication tokens stored in localStorage, capture session cookies, and potentially escalate privileges within the application. The no-code nature of ChatterMate makes this particularly dangerous since administrators may not fully understand the underlying security implications of allowing user input to be rendered without proper sanitization. The vulnerability affects all users interacting with the chatbot framework, creating a widespread attack surface that can be exploited through various delivery mechanisms including social engineering campaigns or compromised user accounts.
Mitigation strategies for CVE-2026-24399 should prioritize immediate deployment of the patched version 1.0.9, which implements proper input sanitization and content security policy enforcement. Organizations should implement comprehensive input validation that strips or escapes all HTML and JavaScript content from user inputs before rendering. The framework should enforce strict content security policies that prevent execution of inline scripts and restrict iframe sources to trusted domains only. Additionally, security headers including Content-Security-Policy should be configured to prevent unauthorized script execution and limit the attack surface. Regular security audits of user input handling mechanisms and implementation of automated vulnerability scanning tools can help prevent similar issues in future development cycles. The vulnerability highlights the importance of implementing defense-in-depth strategies that protect against client-side injection attacks through multiple control layers including input validation, output encoding, and runtime protection mechanisms.