CVE-2026-24399: ChatterMate is a no-code AI chatbot agent framework

Q: How do I fix CVE-2026-24399?

chattermate: upgrade to 1.0.9. Exact commands for each OS are on this page.

Q: Is CVE-2026-24399 being exploited?

CVE-2026-24399 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-24399 affect?

CVE-2026-24399 affects chattermate. Severity is critical (CVSS 9.3). 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 payload containing a javascript: UR

This month

CRITICAL 9.3UPGRADE

CVE-2026-24399 is a critical-severity flaw (CVSS 9.3) affecting chattermate. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.3 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 73%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-01-24
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: chattermate

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-24 01:15 UTCPublished CVE record published
2026-06-17 10:23 UTCUpdated Record last modified

chattermate chattermate UPGRADE

Affected: < 1.0.9

Fixed in: 1.0.9

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy chattermate || rpm -q chattermate || chattermate --version

2. UPGRADE to 1.0.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade chattermate

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade chattermate

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-24399?

chattermate: upgrade to 1.0.9. Exact commands for each OS are on this page.

Is CVE-2026-24399 being exploited?

CVE-2026-24399 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-24399 affect?

CVE-2026-24399 affects chattermate. Severity is critical (CVSS 9.3). 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: UR

How urgent is CVE-2026-24399?

Priority 44/100. Critical severity; Public exploit reference

References

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