Fake StripeApi NuGet Package Identified Stealing Private API Tokens and Secret Keys

Security researchers have identified a fraudulent NuGet package named StripeApi that mimicked the official Stripe library to exfiltrate secret keys from developers.

By: AXL Media

Published: Feb 26, 2026, 7:01 AM EST

Source: Information for this report was sourced from The Hacker News.

Deceptive Nuget Package Targets Stripe Developers

A sophisticated supply chain attack was recently uncovered targeting developers who utilize the Stripe payment processing platform. Security researchers identified a malicious package titled StripeApi hosted on the NuGet gallery, the central package repository for the .NET ecosystem. The package was strategically named to confuse developers looking for the official Stripe.net library, leveraging a common technique known as typosquatting or brand impersonation.

The fraudulent package appeared legitimate at first glance, mirroring the metadata and structure of the official Stripe integration tools. However, once integrated into a development project, the hidden malicious scripts would activate during the build process. This incident underscores the persistent vulnerabilities within open source ecosystems where automated trust can lead to significant security breaches for enterprise and independent developers alike.

Technical Mechanism of API Token Exfiltration

The core functionality of the malicious StripeApi package was the unauthorized collection of sensitive credentials. Researchers found that the code was specifically programmed to scan the host environment for environment variables and configuration files containing Stripe secret keys and API tokens. Once these tokens were identified, the package initiated an outbound network request to transmit the stolen data to a command and control server.

The exfiltration occurred silently in the background, often without triggering standard security alerts that look for more overt forms of malware. By obtaining these secret keys, attackers could theoretically gain full access to a victim's Stripe account, allowing them to view customer data, initiate unauthorized refunds, or redirect payment flows. The precision of the attack indicates that the threat actors possessed a deep understanding of how developers manage payment credentials within modern software architectures.