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Spring Framework, versions 5.0.x prior to 5.0.7, versions 4.3.x prior to 4.3.18, and older unsupported versions, allows web applications to enable cross-domain requests via JSONP (JSON with Padding) through AbstractJsonpResponseBodyAdvice for REST controllers, and MappingJackson2JsonView for browser requests. Both are not enabled by default in Spring Framework nor Spring Boot. However when MappingJackson2JsonView is configured in an application, JSONP support is automatically ready to use through the "jsonp" and "callback" JSONP parameters, enabling cross-domain requests.
Allowing cross-domain requests from untrusted origins may expose user information to 3rd party browser scripts.
This vulnerability applies to applications that:
Users of affected versions should apply the following mitigation:
Applications that do require JSONP support will need to explicitly configure the jsonpParameterNames property of MappingJacksonJsonView following the upgrade. It is recommended that applications switch to using CORS instead of JSONP to enable cross-domain requests. JSONP support in the Spring Framework is deprecated as of 5.0.7 and 4.3.18 and will be removed in 5.1.
This issue was identified and reported by Meyyalagan Chandrasekaran.
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