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PatchSiren cyber security CVE debrief

CVE-2026-39965 baptisteArno CVE debrief

CVE-2026-39965 is a high-severity vulnerability in TypeBot, a chatbot builder tool. Versions 3.15.2 and prior are affected by an SSRF via Open Redirect Bypass, allowing an authenticated user to reach internal services. The issue has been fixed in version 3.16.0. This vulnerability can be exploited to extract cloud IAM credentials or probe internal APIs inaccessible from the internet. Affected operators, platforms, vulnerability-management teams, and security teams should review and act on this vulnerability with caution, considering the potential for internal service exposure.

Vendor
baptisteArno
Product
typebot.io
CVSS
HIGH 7.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-22
Original CVE updated
2026-07-23
Advisory published
2026-05-22
Advisory updated
2026-07-23

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-39965 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-39965

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-39965 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-39965

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.