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In Spring Framework versions 5.3.0 - 5.3.18, 5.2.0 - 5.2.20, and older unsupported versions, the patterns for disallowedFields on a DataBinder are case sensitive which means a field is not effectively protected unless it is listed with both upper and lower case for the first character of the field, including upper and lower case for the first character of all nested fields within the property path.
Users of affected versions should apply the following mitigation: 5.3.x users should upgrade to 5.3.19+. 5.2.x users should upgrade to 5.2.21+. No other steps are necessary, but applications should also review their DataBinder configuration and more broadly their approach to data binding. For more details, please see Data Binding Model Design in the Spring Framework reference manual. Releases that have fixed this issue include:
This vulnerability was discovered internally by the Spring Framework team and is a follow-up to CVE-2022-22965.