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Document effects of disabling CORS #18117

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Nov 4, 2025
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Document effects of disabling CORS #18117

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9 changes: 8 additions & 1 deletion docs/modules/ROOT/pages/reactive/integrations/cors.adoc
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Original file line number Diff line number Diff line change
@@ -1,4 +1,3 @@

[[webflux-cors]]
= CORS

Expand Down Expand Up @@ -75,3 +74,11 @@ fun springSecurityFilterChain(http: ServerHttpSecurity): SecurityWebFilterChain
}
----
======

[WARNING]
====
CORS is a browser-based security feature.
By disabling CORS in Spring Security, you are not removing CORS protection from your browser.
Instead, you are removing CORS support from Spring Security, and users will not be able to interact with your Spring backend from a cross-origin browser application.
To fix CORS errors in your application, you must enable CORS support, and provide an appropriate configuration source.
====
8 changes: 8 additions & 0 deletions docs/modules/ROOT/pages/servlet/integrations/cors.adoc
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Expand Up @@ -183,3 +183,11 @@ fun corsConfigurationSource(): UrlBasedCorsConfigurationSource {
}
----
======

[WARNING]
====
CORS is a browser-based security feature.
By disabling CORS in Spring Security with `.cors(CorsConfigurer::disable)`, you are not removing CORS protection from your browser.
Instead, you are removing CORS support from Spring Security, and users will not be able to interact with your Spring backend from a cross-origin browser application.
To fix CORS errors in your application, you must enable CORS support, and provide an appropriate configuration source.
====