CVE Catalog

CVE-2026-39964

MediumCVSS 5.4
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.24%

15th percentile - higher than 15% of all known CVEs

Summary

In TypeBot prior to version 3.16.0, the viewer renders anchor tags from rich text bubble content without filtering the javascript: URI scheme. A bot author can set a link URL to javascript:PAYLOAD, which executes in the visitor's browser context.

Risk Assessment

An attacker can exfiltrate cookies and session tokens from the host page, potentially leading to account takeover.

Recommendation

Update TypeBot to version 3.16.0. Restrict bot creation to trusted users.

Other vulnerabilities in TypeBot

See all
Original NVD description (English source)

TypeBot is a chatbot builder tool. In versions prior to 3.16.0, the Typebot viewer (packages/embeds/js) renders anchor tags from rich text bubble content without filtering the javascript: URI scheme. A bot author can set a link URL to javascript:PAYLOAD, which executes in the visitor's browser context when clicked. Since the viewer is typically embedded in a third-party site, the attacker's JavaScript runs in the host page's origin and can exfiltrate cookies and session tokens. This can result in any authenticated Typebot user (including those on the free tier) being able to create a bot with this payload. Shared bots are publicly accessible — no victim authentication is required. This issue has been resolved in version 3.16.0.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS