CVE-2026-39965 baptisteArno CVE debrief

Who should care

Users of TypeBot versions 3.15.2 and prior should apply the patch in version 3.16.0 to prevent SSRF attacks. Affected operators, platforms, vulnerability-management teams, and security teams should review and act on this vulnerability, prioritizing internal service protection and verifying affected deployments. Security teams should also monitor for suspicious activity and review compensating controls for exposed systems.

Technical summary

TypeBot, a chatbot builder tool, contains an SSRF via Open Redirect Bypass vulnerability in versions 3.15.2 and prior. The HTTP Request block and Code block validate the initial request URL via validateHttpReqUrl() to block private IPs and cloud metadata hostnames. However, the HTTP clients (ky and fetch) follow 302 redirects without re-validating the redirect destination. An authenticated user can point a bot block to an attacker-controlled server that responds with a redirect to an internal IP, causing the Typebot server to reach internal services.

Defensive priority

High

Recommended defensive actions

• Apply the patch in version 3.16.0
• Restrict access to the TypeBot server
• Monitor for suspicious activity
• Review compensating controls for exposed systems
• Check relevant monitoring, detection, and logs for exposed assets
• Track exceptions and retest remediated assets
• Confirm whether affected product deployments exist in managed environments

Evidence notes

The CVE record was published on 2026-05-22T18:16:21.857Z and last modified on 2026-07-23T16:10:00.137Z. The NVD entry is currently Deferred. Evidence is limited to CVE and NVD details. Defenders should verify affected TypeBot deployments, review official advisories, and check for any additional information that may not be publicly available. Limited source detail suggests exercising caution and verifying information through multiple sources.

Official resources