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Medium, CVSS 5.4amended

Typebot.io has stored XSS via javascript: URI in text bubble links — bot author executes JS on visitors' browsers

CVE-2026-39964GHSA-hqmv-v56g-4m47

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@typebot.io/js 0.10.1), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.4 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
EPSS
  • CVE-2026-39964: 0.24% estimated exploitation activity in the next 30 days; percentile 15.32 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary 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. Details Vulnerable file: packages/embeds/js/src/features/blocks/bubbles/textBubble/components/plate/PlateBlock.tsx SolidJS does not sanitize href attribute values — javascript: URIs pass through to the DOM unchanged. The same issue exists in ImageBubble.tsx line 102 for image link wrapping. Steps to Reproduce Source-verified: PlateBlock.tsx:32 renders <a href={url} with no scheme filtering. Puppeteer alert confirmed document.domain execution when link clicked. Impact - Any authenticated Typebot user (including free tier) can create a bot with this payload - When…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-hqmv-v56g-4m47

  2. Revision 1 · created ·

    Published from osv record GHSA-hqmv-v56g-4m47

Agent brief

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# Patch Next advisory brief: CVE-2026-39964

Advisory: Typebot.io has stored XSS via `javascript`: URI in text bubble links — bot author executes JS on visitors' browsers
IDs: CVE-2026-39964, GHSA-hqmv-v56g-4m47
Record: https://patchnext.com/advisories/cve-2026-39964 (revision 2, source checked 26 Oct 2026, 12:52 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @typebot.io/js 0.10.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @typebot.io/js: affected < 0.10.1; fixed in 0.10.1

## Suggested inspection (read-only)
- `npm ls @typebot.io/js --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @typebot.io/js.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-hqmv-v56g-4m47 (OSV record GHSA-hqmv-v56g-4m47 lists affected ranges: npm @typebot.io/js >=0 <0.10.1 (fixed))
- Verified: https://github.com/advisories/GHSA-hqmv-v56g-4m47 (GitHub-reviewed advisory GHSA-hqmv-v56g-4m47 lists affected ranges: npm @typebot.io/js >=0 <0.10.1)

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