How Vulnerable Are Single Sign-On Systems to Modern Credential Attacks?

Credential abuse continues to be a significant issue in data breaches, appearing in 39% of cases according to the Verizon 2026 Data Breach Investigations Report. This persistence is attributed to weaknesses in how single sign-on (SSO) systems are managed, rather than flaws in the SAML or OIDC protocols themselves. Attackers often exploit weak login points, inadequate management of admin accounts, and the failure to revoke access when no longer needed. Notable incidents, such as the University of Pennsylvania breach, illustrate how a single compromised SSO account can lead to widespread access across multiple systems, affecting millions of individuals' data. Modern SSO credential attacks often involve phishing and the misuse of OAuth tokens, which are not inherently protected by multi-factor authentication (MFA). Effective controls to mitigate these risks include deploying phishing-resistant MFA, securing admin accounts with hardware-backed keys, ensuring timely deprovisioning of access, and regularly rotating OAuth tokens. The focus should be on strengthening the protection around SSO logins to prevent attackers from leveraging a single compromised credential to access multiple applications.

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