What Is Supply-Chain Attack?
A supply-chain attack targets a trusted third party — a software vendor, open-source dependency, SaaS integration, or service provider — rather than attacking the ultimate victim directly. By compromising something the target already trusts and connects to, an attacker inherits that trust and gains access without needing to breach the target's own defenses. In modern IT environments, this trust is frequently expressed as machine credentials: API keys, OAuth tokens, or service accounts that let a vendor's software or an integrated tool talk to a company's systems. If the vendor or dependency is compromised, those same credentials can be used to move laterally into every customer environment connected through them.
Why It Matters
Non-human identities are the connective tissue of the modern software supply chain — every third-party integration, CI/CD pipeline, and SaaS-to-SaaS connection relies on an API key, OAuth token, or service account to function. This makes NHIs the natural target once an attacker compromises a vendor or dependency, because that stolen credential often carries broad, long-lived, and poorly monitored access into every customer it touches. A single over-privileged integration token can turn one vendor breach into a blast radius spanning hundreds of downstream organizations. OWASP's NHI Top 10 (2025) identifies exactly this pattern — 80% of identity breaches involve a non-human identity — and regulators have taken notice: NIS2, enforced from October 1, 2026, and ANSSI's ReCyF Objective 13 both require organizations to account for and secure machine credentials tied to third-party and supply-chain access, not just employee accounts.
How Cydenti Helps
Cydenti maps the web of non-human identities that connect your organization to vendors, integrations, and dependencies, showing exactly which API keys, OAuth tokens, and service accounts carry third-party access and what those credentials can reach. When a vendor discloses a breach, Cydenti helps teams instantly identify which of their own NHIs are exposed and need rotation, rather than guessing. This visibility turns supply-chain risk from an abstract worry into a concrete, actionable list — see how Cydenti approaches OAuth and third-party risk in more depth.
Explore →Frequently Asked Questions
How does a supply-chain attack relate to non-human identities?
Third-party integrations, vendor software, and open-source dependencies almost always connect to a company's systems through an API key, OAuth token, or service account. If that vendor or dependency is compromised, the attacker inherits those credentials and can use them to reach every customer environment the integration is connected to, without needing separate access.
What makes supply-chain attacks harder to detect than direct attacks?
The access used in a supply-chain attack is legitimate — it belongs to a trusted vendor or integration and often has broad, standing permissions. Because the credential itself isn't inherently suspicious, unusual activity can blend into normal traffic unless an organization actively monitors what each third-party identity is authorized to do and whether its behavior changes.
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