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

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

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. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Craft malicious iframe with javascript: URI

Exploit

Submit payload via chat input

Execution

Browser executes injected script

Impact

Steal localStorage tokens and cookies