Spring WebFlux applications that have Spring Security authorization rules on static resources can be bypassed under certain circumstances.

For this to impact an application, all of the following must be true:

• It must be a WebFlux application
• It must be using Spring's static resources support
• It must have a non-permitAll authorization rule applied to the static resources support

This affects the following Spring Security versions:

• 5.7.0 - 5.7.12
• 5.8.0 - 5.8.14
• 6.0.0 - 6.0.12
• 6.1.0 - 6.1.10
• 6.2.0 - 6.2.6
• 6.3.0 - 6.3.3
• Older, unsupported versions are also affected

The vulnerability was reported responsibly by tkswifty and [email protected]