TI-2026-28820 Aliases CVE-2026-39964 GHSA-hqmv-v56g-4m47

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

MEDIUM 58CWE-79Published 2026-05-22 · Updated 2026-05-23

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00241 15th percentileScored 2026-11-07

Fix Fixed typebot.io (baptisteArno): 3.16.0@typebot.io/js (npm): 0.10.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
baptisteArno	typebot.io	before 3.16.0	3.16.0	Patch available	CNA
—	@typebot.io/js (npm)	before 0.10.1	0.10.1	Patch available	GHSA-hqmv-v56g-4m47

typebot.io VendorbaptisteArno Affected before 3.16.0 Fixed in 3.16.0 Patch available CNA
@typebot.io/js (npm) Vendor— Affected before 0.10.1 Fixed in 0.10.1 Patch available GHSA-hqmv-v56g-4m47

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:typebot:typebot::::::::	—	—	baptisteArno

cpe:2.3:a:typebot:typebot:*:*:*:*:*:*:*:* Versions — — ·baptisteArno

Remediation

Fix · CNA typebot.io (baptisteArno) Fixed in 3.16.0
Fix · GHSA-hqmv-v56g-4m47 @typebot.io/js (npm) Fixed in 0.10.1 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-39964
2026-10-03 Alias added: GHSA-hqmv-v56g-4m47

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-39964

Other 4

TI-2026-26091 TypeBot: Unauthenticated SSRF via isolated-vm fetch in preview chat endpoint bypasses SSRF controls CVSS 3.1CRITICAL 10.0
TI-2026-36038 TypeBot: Unauthenticated arbitrary s3 object write in generate-upload-url via unsanitized fileName CVSS 3.1CRITICAL 9.3
TI-2026-44929 TypeBot: Arbitrary server file read via Send Email block attachment path CVSS 4.0HIGH 8.7
TI-2026-36035 TypeBot vulnerable to cross-workspace OAuth credential takeover in updateOAuthCredentials via missing object binding CVSS 3.1CRITICAL 9.9
TI-2026-35208 TypeBot vulnerable to CSV injection in result export CVSS 3.1CRITICAL 9.6
TI-2025-40055 Typebot May Expose AWS EKS Credentials via Server Side Request Forgery in Webhook Block CVSS 3.1CRITICAL 9.9

See all 35 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences