CVE-2026-62865 baptisteArno CVE debrief

Who should care

Defenders responsible for Typebot instances, particularly those with self-hosted versions prior to 3.18.0, should assess exposure and prioritize upgrading to prevent exploitation. They should also review and restrict access to the Send Email integration block, monitor for suspicious activity, and track exceptions.

Why it matters

CVE-2026-62865 is a high-severity vulnerability in Typebot that allows arbitrary reading of local files on the server. Defenders should prioritize upgrading to version 3.18.0 or later to prevent exploitation.

• Reading arbitrary files on the server
• Potential exposure of process environment secrets
• Possible disruption of service through exploitation

Technical summary

The vulnerability is caused by the server-side Send Email integration block's ability to build Nodemailer attachments from a typebot variable. The parseAttachments helper returns the supplied value as a filesystem path whenever it does not start with the application's own base URL. This allows an attacker to read any file the server process can access, including process environment secrets, without administrative privileges or victim interaction. The issue is fixed in version 3.18.0. There is no evidence of in-the-wild exploitation.

Defensive priority

Defenders should prioritize upgrading to version 3.18.0 or later to prevent exploitation.

Recommended defensive actions

• Upgrade to Typebot version 3.18.0 or later
• Review and restrict access to the Send Email integration block
• Monitor for suspicious activity in Typebot instances
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The vulnerability allows arbitrary reading of local files on the server through the Send Email integration block. Attackers can publish a bot whose Send Email block attaches an absolute path such as /etc/passwd or /proc/self/environ and mails it to an address they control, enabling reading of any file the server process can access, including process environment secrets. The issue is fixed in version 3.18.0. There is no evidence of in-the-wild exploitation.

Sources and 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.