What is CVE-2026-39964?

CVE-2026-39964 is a medium-severity vulnerability in Baptistearno Typebot.io, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-05-22.

How severe is CVE-2026-39964?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Baptistearno Typebot.io

CVE-2026-39964

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 java…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (15.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Baptistearno Typebot.io — versions < 3.16.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-39964?: CVE-2026-39964 is a medium-severity vulnerability in Baptistearno Typebot.io, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-05-22.
How severe is CVE-2026-39964?: Medium severity. CVSS v3 base score is 5.4 out of 10.