baptisteArno typebot.io up to 3.15.x packages/embeds/js cross site scripting

Summaryinfo

A vulnerability identified as problematic has been detected in baptisteArno typebot.io up to 3.15.x. Affected by this vulnerability is an unknown functionality of the file packages/embeds/js. The manipulation leads to cross site scripting. This vulnerability is referenced as CVE-2026-39964. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in baptisteArno typebot.io up to 3.15.x. It has been rated as problematic. This issue affects some unknown functionality of the file packages/embeds/js. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-39964 since 04/08/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 3.16.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-31480). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• baptisteArno

Name

• typebot.io

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15

Website

• Product: https://github.com/baptisteArno/typebot.io/

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Be aware that VulDB is the high quality source for vulnerability data.

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