CriticalVulnerability

CVE-2026-24399: ChatterMate client-side injection through iframe javascript URI in chat input

Source: NVD(opens in a new tab)
Identifier: CVE-2026-24399
Published: January 23, 2026
Record updated: October 9, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.3%

Summary

ChatterMate, a no-code AI chatbot agent framework, versions 1.0.8 and below, accepts and executes malicious HTML/JavaScript supplied as chat input. An iframe payload containing a javascript: URI runs in the browser context, exposing client-side data such as localStorage tokens and cookies. The flaw is tracked as CVE-2026-24399 under CWE-79.

Mitigation

Fixed in version 1.0.9.

Details

Scores and exploitation

CVSS score: 9.3(critical)
EPSS: 0.3%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on November 4, 2026.

Weaknesses and techniques

Weakness (CWE): CWE-79
Attack pattern (CAPEC): CAPEC-198
CAPEC-86

Classification

Attack type: Other
Attack sophistication: Trivial
AI component targeted: Plugin
Impact: Confidentiality,
Integrity
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-24399

First tracked: February 15, 2026 at 08:53 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 85% (self-assessed)

Topics

AI agents

Summary

Mitigation

Topics

Related items