CVE-2019-4203: SSRF in IBM API Connect Developer Portal

The primary impact of CVE-2019-4203 is the potential for unauthorized access to sensitive data stored on the host operating system. An attacker, posing as a legitimate app developer, could exploit this SSRF vulnerability to download configuration files, credentials, or other confidential information. This could lead to data breaches, privilege escalation, and further compromise of the API Connect environment. The ability to initiate requests to internal resources also opens the door to lateral movement within the network, allowing an attacker to target other systems accessible from the Developer Portal server. The blast radius extends to any data accessible by the API Connect server, including databases, file shares, and cloud storage services.

1. Reserved2019-01-03
2. Published2019-04-15
3. Modified2024-09-17
4. EPSS updated2026-04-02

The recommended mitigation for CVE-2019-4203 is to upgrade to IBM API Connect Developer Portal version 5.0.9 or later. If upgrading is not immediately feasible, consider implementing temporary workarounds to restrict outbound network access from the Developer Portal. This can be achieved through firewall rules or web application proxies that block requests to unauthorized internal resources. Carefully review and restrict the permissions granted to app developers to minimize the potential impact of a successful SSRF attack. Monitor API Connect logs for suspicious outbound requests originating from app developer accounts.