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CVE-2026-39964

TypeBot: Stored XSS via javascript: URI in text bubble links — bot author executes JS on visitors' browsers

Published: May 22, 2026Updated: May 23, 2026 Sources: CVE ListCWE-79CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
NVD MITRE
5.4CVSSMEDIUM
EPSS Score
0.3%
Top 82.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

Description

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-79CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

typebot.iobaptisteArno
SaaS
Cloud & SaaS / saas-application
baptistearnoCloud & SaaSaka typebot.io

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-hqmv-v56g-4m47
github.com
https://github.com/baptisteArno/typebot.io/commit/2c3fc7267a5e1529ba4b1a2ab4f1edb3e3b8990b
github.com
https://github.com/baptisteArno/typebot.io/releases/tag/v3.16.0
github.com

Timeline

Published
May 22, 2026
Last Updated
May 23, 2026

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