Securing identity APIs against server-side request forgery (SSRF) at Stytch

Server-side request forgery (SSRF) is a significant security vulnerability that allows attackers to manipulate servers into making unauthorized requests, potentially accessing sensitive internal data. This issue is particularly critical for identity infrastructure, where even minor vulnerabilities can lead to extensive data breaches, such as the Capital One incident. SSRF vulnerabilities often exploit features like user-provided URLs, overlooked DNS security, and inadequate network segmentation, making it a hidden yet potent threat. Protecting against SSRF requires multiple layers of defense, including strict validation of user inputs, network access restrictions, and secure HTTP client configurations. Stytch, a managed identity solution provider, embeds these safeguards into their infrastructure by using hardened HTTP clients, public DNS resolution, and network-layer policies to prevent unauthorized access and data leakage. These measures help mitigate SSRF risks, allowing engineering teams to focus on product development while maintaining robust security.

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