baptisteArno Typebot up to 3.17.x Send Email integration block parseAttachments attachment path traversal

Summaryinfo

A vulnerability identified as problematic has been detected in baptisteArno Typebot up to 3.17.x. Affected is the function parseAttachments of the component Send Email integration block. This manipulation of the argument attachment causes path traversal. This vulnerability appears as CVE-2026-62865. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability has been found in baptisteArno Typebot up to 3.17.x and classified as problematic. Affected by this vulnerability is the function parseAttachments of the component Send Email integration block. The manipulation of the argument attachment with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality. The summary by CVE is:

Typebot is an open-source chatbot builder. In self-hosted versions prior to 3.18.0, the server-side Send Email integration block allows arbitrary reading of local files on the server. The block builds Nodemailer attachments from a typebot variable, and its parseAttachments helper returns the supplied value as a filesystem path whenever it does not start with the application's own base URL, instead of requiring an http or https URL. The Nodemailer transport is created without disableFileAccess or disableUrlAccess, both of which default to false, so an attachment specified as an absolute server path is read from the local filesystem and delivered. Because both the attachment value and the recipient list are attacker-controllable typebot variables, any registered user 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. This enables reading any file the server process can access, including process environment secrets such as the credential encryption key and database connection string, without administrative privileges or victim interaction. Open signup is enabled by default and the system SMTP credential is already configured, so no non-default configuration is required. This issue is fixed in version 3.18.0.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-62865 since 07/14/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 3.18.0 eliminates this vulnerability.

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Productinfo

Vendor

• baptisteArno

Name

• Typebot

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15
• 3.16
• 3.17

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CPE 2.2info

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