CVE-2026-39970 Details
Description
TypeBot is a chatbot builder tool. Versions 3.15.2 and prior contain a critical stored XSS vulnerability in the app.typebot.io profile picture upload form. The application fails to sanitize or restrict SVG/XML-based uploads and directly renders them when accessed through the domain. By uploading a crafted malicious SVG file containing embedded JavaScript, an attacker will execute arbitrary JavaScript code. This vulnerability directly enables stored XSS exploitation because the payload is persistently stored on your infrastructure (app.typebot.io) and accessible from a public-facing, permanent link. Stored XSS via malicious SVG uploads to app.typebot.io allows attackers to execute arbitrary JavaScript in victims' browsers, enabling session/token theft, account takeover, and exfiltration of sensitive user data. This issue has been fixed in version 3.16.0.
A critical stored cross-site scripting (XSS) vulnerability has been identified in TypeBot versions through 3.15.2. The issue arises in the profile picture upload form, where the application fails to properly sanitize or restrict SVG/XML-based uploads. This allows an attacker to upload a malicious SVG file containing embedded JavaScript, which is then executed when the file is accessed through the domain. The vulnerability is particularly concerning because the malicious payload is persistently stored on the user's infrastructure (app.typebot.io) and can be accessed via a public, permanent link. Exploitation of this vulnerability enables the execution of arbitrary JavaScript in the browsers of users who access the uploaded file, potentially leading to session theft, account takeover, and exfiltration of sensitive user data.
Users are advised to update to TypeBot version 3.16.0, which addresses the stored XSS vulnerability by disallowing script execution in SVG files.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 22, 2026CISA-ADP
Assessed May 22, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-jj87-c343-26vp | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/baptisteArno/typebot.io/releases/tag/v3.16.0 | [email protected] | Release NotesVendor |
| https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-jj87-c343-26vp | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| TypeBot | <= 3.15.2 (semver) |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 22, 2026 | CVE Modified | CISA-ADP |
| May 22, 2026 | New CVE Received | [email protected] |