When processing authorization requests using the whitelabel views in Spring Security OAuth 2.0.0 to 2.0.9 and 1.0.0 to 1.0.5, the response_type parameter value was executed as Spring SpEL which enabled a malicious user to trigger remote code execution via the crafting of the value for response_type.
https://github.com/Drun1baby/CVE-Reproduction-And-Analysis
https://github.com/tpt11fb/SpringVulScan
https://github.com/advisories/GHSA-7q9c-h23x-65fq