What’s Vulnerable › Vulnerabilities

CVE-2026-24399: ChatterMate has Stored Cross-Site Scripting (XSS) via Chatbot Input Execution

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-01-24 · updated 2026-06-17
• Weakness: CWE-79

Description

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.

Affected products

• chattermate.chat: before 1.0.9 — fixed in 1.0.9

How to fix

Upgrade to a fixed version: chattermate.chat 1.0.9. Check the vendor advisory for mitigations.

References

• https://github.com/chattermate/chattermate.chat/commit/ff3398031abb97ae28546eaf993fed3619eaffdd
• https://github.com/chattermate/chattermate.chat/releases/tag/v1.0.9
• https://github.com/chattermate/chattermate.chat/security/advisories/GHSA-72p3-w95w-q3j4

Get alerted when CVE-2026-24399 or the next vulnerability affects your stack