Vulnerability Description
Typebot is a chatbot builder tool. In versions 3.15.2 and prior, the RatingButton component in the embed package renders the user-controlled customIcon.svg field directly via Solid's innerHTML directive without any sanitization, even though DOMPurify is already a dependency and is used elsewhere in the codebase (e.g., StreamingBubble.tsx). Because rating blocks are not flagged as isUnsafe by the import sanitizer and the builder preview renders bots inline on the builder's own origin (builder.typebot.io) under a CSP permitting 'unsafe-inline', a malicious imported or collaborator-crafted typebot can execute arbitrary HTML/JS in the builder's authenticated context, bypassing the Web Worker sandbox that protects Script blocks during preview. This allows session hijacking and privilege escalation within the builder application. This issue has been fixed in version 3.16.0.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/baptisteArno/typebot.io/commit/474ecbf46bc47a75265bada2599f12
- https://github.com/baptisteArno/typebot.io/releases/tag/v3.16.0
- https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-6m7c-xfhp-p9
- https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-6m7c-xfhp-p9
FAQ
What is CVE-2026-28445?
CVE-2026-28445 is a vulnerability with a CVSS score of 8.7 (HIGH). Typebot is a chatbot builder tool. In versions 3.15.2 and prior, the RatingButton component in the embed package renders the user-controlled customIcon.svg field directly via Solid's innerHTML directi...
How severe is CVE-2026-28445?
CVE-2026-28445 has been rated HIGH with a CVSS base score of 8.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-28445?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.