Cross-Site Scripting (XSS) in @typebot.io/js (CVE-2026-39964)
Summary
Cross-site scripting in @typebot.io/js (CVE-2026-39964). Risk of unauthorized operations or information disclosure. Exploitable via href. Mitigation: upgrade to 0.10.1 or later.
Original description
The description as published by the source.
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.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-39964 has been found in @typebot.io/js.
Attackers can target a specific entry point like href over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.4/10.
What to do: upgrade @typebot.io/js to 0.10.1 or later.
If unsure, ask your IT team or search "@typebot.io/js CVE-2026-39964" on the vendor's site.
CVE-2026-39964 (@typebot.io/js) — CWE-79 / CVSS v3 5.4
Attack vector: remote (network-reachable)
Attack surface: href / ImageBubble.tsx / document.domain
Patched: 0.10.1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Cross-site scripting (XSS) (CWE-79) exists in @typebot.io/js. Attackers reach the vulnerable code path via href.
Check the vendor advisory for the affected versions of @typebot.io/js. Attack surface: href / ImageBubble.tsx / document.domain.
Severity: Medium (CVSS 5.4/10). Risk of unauthorized operations or information disclosure.
Update to 0.10.1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r '@typebot.io/js' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r '@typebot.io/js' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
@typebot.io/jsを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade @typebot.io/js to 0.10.1ステージング環境で 0.10.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- patch github.com
- web github.com
- web github.com