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Improper Authentication


Severity Medium
Score 6.1/10


Spring Authorization Server versions through 1.0.5, 1.1.0-M1 through 1.1.5, 1.2.0-M1 through 1.2.2, and 1.3.0-M1 through 1.3.0-M2 are susceptible to a PKCE Downgrade Attack for Confidential Clients. Specifically, an application is vulnerable when a Confidential Client uses PKCE for the Authorization Code Grant. An application is not vulnerable when a Public Client uses PKCE for the Authorization Code Grant.

  • LOW
  • LOW
  • NONE
  • LOW
  • NONE

CWE-287 - Improper Authentication

Improper (or broken) authentication attacks are widespread, and have accounted for many of the worst data breaches in recent years. Improper authentication attacks are a class of vulnerabilities where an attacker impersonates a legitimate user by exploiting weaknesses in either session management or credential management to gain access to the user’s account. This can result in disclosure of sensitive information, and can lead to system compromise, theft, identity theft, and fraud.

Advisory Timeline

  • Published