What is the CVSS score of CVE-2026-24399?

CVE-2026-24399 has a CVSS 3.1 base score of 9.3 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N. EPSS exploitation probability: 0.0%.

Which versions of AI / ML are affected by CVE-2026-24399?

ChatterMate chatbot instances running versions 1.0.8 and below are vulnerable to arbitrary code execution through malicious chat inputs, allowing attackers to compromise customer data, deploy…. A patch is available.

Is there a public PoC exploit available for CVE-2026-24399?

Yes, a public proof-of-concept exploit is available for CVE-2026-24399. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-24399?

Within 24 hours: Identify all ChatterMate deployments and their versions; disable public-facing ChatterMate instances if running vulnerable versions. Within 7 days: Apply vendor patches to all affected systems and validate remediation in staging environments. Within 30 days: Conduct security audit of patched systems, review chat logs for exploitation attempts, and implement input validation monitoring.

AI / ML CVE-2026-24399

CRITICAL

Cross-site Scripting (XSS) (CWE-79)

2026-01-24 security-advisories@github.com

XSS AI / ML Chattermate

9.3

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

9.3 CRITICAL

AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:59 vuln.today

PoC Detected

Feb 12, 2026 - 16:05 vuln.today

Public exploit code

Patch released

Feb 12, 2026 - 16:05 nvd

Patch available

CVE Published

Jan 24, 2026 - 01:15 nvd

CRITICAL 9.3

DescriptionGitHub Advisory

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.

AnalysisAI

Stored XSS in ChatterMate AI chatbot framework versions 1.0.8 and below. The chatbot accepts and renders malicious HTML/JavaScript from user input. PoC and patch available.