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CVE-2026-24399

Chattermate cross-site scripting (XSS)

9.3 CRITICALPublic exploitEPSS 0.34%
  1. Published24 Jan 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Affected products

Chattermate< 1.0.9

Remediation

Fixed in
Chattermate≥ 1.0.9

References

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Frequently asked

Is CVE-2026-24399 being actively exploited?

CVE-2026-24399 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.34%.

How severe is CVE-2026-24399?

CVE-2026-24399 has a CVSS 3.1 base score of 9.3, rated critical. EPSS estimates a 0.34% probability of exploitation.

Which products are affected by CVE-2026-24399?

Affected products include Chattermate.

How do I fix CVE-2026-24399?

Upgrade affected software to a fixed version, for example Chattermate 1.0.9 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-24399 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.