Spring Security Advisories

CVE-2023-20866: Session ID can be logged to the standard output stream in Spring Session

MEDIUM | APRIL 12, 2023 | CVE-2023-20866


In Spring Session version 3.0.0, the session id can be logged to the standard output stream. This vulnerability exposes sensitive information to those who have access to the application logs and can be used for session hijacking.

Specifically, an application is vulnerable when the following is true:

  • You are using the HeaderHttpSessionIdResolver

An application is not vulnerable if any of the following is true:

  • You are not using the HeaderHttpSessionIdResolver

Affected Spring Products and Versions

Spring Session 3.0.0


Users of affected versions should upgrade to Spring Session 3.0.1. Releases that have fixed this issue include:

  • Spring Session 3.0.1


This issue was identified and responsibly reported by Benedikt Halser from DATEV eG

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