Mitigation Strategies

The primary mitigation is to upgrade typebot.io to version 3.17.2 or later, where the SSRF vulnerability has been fixed by blocking IPv6 unspecified addresses and improving SSRF IP validation to prevent DNS rebinding attacks.

Additional mitigation includes ensuring that SSRF validators properly block all unspecified IP addresses (0.0.0.0/8 and ::/128), loopback, and private IP ranges, and pin the resolved IP address during the entire request to prevent TOCTOU issues.

Useful 0 Not Useful 0

Executive Summary

CVE-2026-48764 is a Server-Side Request Forgery (SSRF) vulnerability in the TypeBot chatbot builder tool versions prior to 3.17.2. The vulnerability arises because the SSRF validation only resolves a hostname once to check if its IP address is in a forbidden range, but the actual HTTP request later resolves the hostname again without pinning the validated IP. This time-of-check to time-of-use (TOCTOU) gap allows an attacker to use DNS rebinding to bypass the SSRF protections.

An attacker can supply a URL to a public bot that performs server-side HTTP requests. Initially, the domain resolves to a public IP and passes validation, but when the real request is made, the domain resolves to a private or metadata IP address. This enables unauthorized server-side access to internal network services, cloud metadata endpoints, and other protected HTTP targets.

Useful 0 Not Useful 0

Impact Analysis

This vulnerability can have serious impacts because it allows attackers to bypass SSRF protections and access internal network services that should be restricted. Potential impacts include:

• Disclosure of sensitive metadata from cloud environments.
• Access to internal administrative panels that are not meant to be publicly reachable.
• Theft of credentials from metadata services.
• Further compromise of internal systems through HTTP interfaces that are only accessible internally.

Useful 0 Not Useful 0

Detection Guidance

This vulnerability involves a time-of-check to time-of-use gap in SSRF validation, where the hostname is resolved once for validation but re-resolved during the actual request, allowing DNS rebinding attacks. Detection would involve monitoring for unusual DNS resolution patterns or outbound HTTP requests to internal or metadata IP addresses that should be blocked.

Suggested detection methods include inspecting logs for server-side HTTP requests to private IP ranges or metadata service IPs (e.g., 169.254.169.254), and monitoring DNS queries for rebinding behavior where a hostname resolves to a public IP initially and then to a private IP.

Specific commands are not provided in the available resources.

Useful 0 Not Useful 0

Compliance Impact

The vulnerability allows an attacker to perform Server-Side Request Forgery (SSRF) via DNS rebinding, enabling unauthorized access to private network services and cloud metadata endpoints.

This can lead to metadata disclosure, access to internal admin panels, and credential theft from metadata services, which may result in unauthorized access to sensitive data.

Such unauthorized access and potential data exposure could negatively impact compliance with data protection regulations like GDPR and HIPAA, which require strict controls over access to personal and sensitive information.

Therefore, exploitation of this vulnerability could lead to violations of these standards due to compromised confidentiality and potential data breaches.

Useful 0 Not Useful 0