diff --git a/apps/backend/src/app/api/latest/internal/configs/crud.tsx b/apps/backend/src/app/api/latest/internal/configs/crud.tsx
index d49a486fc..03ed2092e 100644
--- a/apps/backend/src/app/api/latest/internal/configs/crud.tsx
+++ b/apps/backend/src/app/api/latest/internal/configs/crud.tsx
@@ -7,7 +7,7 @@ export const configCrudHandlers = createLazyProxy(() => createCrudHandlers(confi
   paramsSchema: yupObject({}),
   onRead: async ({ auth }) => {
     return {
-      configString: JSON.stringify(auth.tenancy.config),
+      config_string: JSON.stringify(auth.tenancy.config),
     };
   },
 }));
diff --git a/apps/backend/src/app/api/latest/internal/configs/overrides/crud.tsx b/apps/backend/src/app/api/latest/internal/configs/overrides/crud.tsx
index ed44f9a2b..c16e35228 100644
--- a/apps/backend/src/app/api/latest/internal/configs/overrides/crud.tsx
+++ b/apps/backend/src/app/api/latest/internal/configs/overrides/crud.tsx
@@ -1,4 +1,4 @@
-import { getRenderedEnvironmentConfigQuery, overrideEnvironmentConfigOverride } from "@/lib/config";
+import { getRenderedEnvironmentConfigQuery, overrideEnvironmentConfigOverride, validateEnvironmentConfigOverride } from "@/lib/config";
 import { globalPrismaClient, rawQuery } from "@/prisma-client";
 import { createCrudHandlers } from "@/route-handlers/crud-handler";
 import { configOverrideCrud } from "@stackframe/stack-shared/dist/interface/crud/config";
@@ -9,16 +9,27 @@ import { createLazyProxy } from "@stackframe/stack-shared/dist/utils/proxies";
 export const configOverridesCrudHandlers = createLazyProxy(() => createCrudHandlers(configOverrideCrud, {
   paramsSchema: yupObject({}),
   onUpdate: async ({ auth, data }) => {
-    if (data.configOverrideString) {
+    if (data.config_override_string) {
       let parsedConfig;
       try {
-        parsedConfig = JSON.parse(data.configOverrideString);
+        parsedConfig = JSON.parse(data.config_override_string);
       } catch (e) {
         if (e instanceof SyntaxError) {
           throw new StatusError(StatusError.BadRequest, 'Invalid config JSON');
         }
         throw e;
       }
+
+      const validationResult = await validateEnvironmentConfigOverride({
+        environmentConfigOverride: parsedConfig,
+        branchId: auth.tenancy.branchId,
+        projectId: auth.tenancy.project.id,
+      });
+
+      if (validationResult.status === "error") {
+        throw new StatusError(StatusError.BadRequest, validationResult.error);
+      }
+
       await overrideEnvironmentConfigOverride({
         projectId: auth.tenancy.project.id,
         branchId: auth.tenancy.branchId,
@@ -32,7 +43,7 @@ export const configOverridesCrudHandlers = createLazyProxy(() => createCrudHandl
     }));
 
     return {
-      configOverrideString: JSON.stringify(updatedConfig),
+      config_override_string: JSON.stringify(updatedConfig),
     };
   },
 }));
diff --git a/apps/e2e/tests/backend/endpoints/api/v1/internal/config-overrides.test.ts b/apps/e2e/tests/backend/endpoints/api/v1/internal/config-overrides.test.ts
index e06067013..1e4a9e27f 100644
--- a/apps/e2e/tests/backend/endpoints/api/v1/internal/config-overrides.test.ts
+++ b/apps/e2e/tests/backend/endpoints/api/v1/internal/config-overrides.test.ts
@@ -339,14 +339,14 @@ it("returns an error when the oauth config is misconfigured", async ({ expect })
   });
 
   // Test invalid OAuth provider type
-  const invalidTypeResponse = await niceBackendFetch("/api/v1/internal/config-overrides", {
+  const invalidTypeResponse = await niceBackendFetch("/api/v1/internal/configs/overrides", {
     method: "PATCH",
     accessType: "admin",
     headers: {
       'x-stack-admin-access-token': adminAccessToken,
     },
     body: {
-      config: JSON.stringify({
+      config_override_string: JSON.stringify({
         'auth.oauth.providers.invalid': {
           type: 'invalid-provider',
           isShared: false,
@@ -359,43 +359,13 @@ it("returns an error when the oauth config is misconfigured", async ({ expect })
     },
   });
 
-  expect(invalidTypeResponse.status).toBe(400);
-
-  // Test missing required fields for non-shared provider
-  const missingFieldsResponse = await niceBackendFetch("/api/v1/internal/config-overrides", {
-    method: "PATCH",
-    accessType: "admin",
-    headers: {
-      'x-stack-admin-access-token': adminAccessToken,
-    },
-    body: {
-      config: JSON.stringify({
-        'auth.oauth.providers.google': {
-          type: 'google',
-          isShared: false,
-          allowSignIn: true,
-          allowConnectedAccounts: true,
-          // Missing clientId and clientSecret
-        },
-      }),
-    },
-  });
-
-  expect(missingFieldsResponse.status).toBe(400);
-
-  // Test invalid JSON
-  const invalidJsonResponse = await niceBackendFetch("/api/v1/internal/config-overrides", {
-    method: "PATCH",
-    accessType: "admin",
-    headers: {
-      'x-stack-admin-access-token': adminAccessToken,
-    },
-    body: {
-      config: "invalid json",
-    },
-  });
-
-  expect(invalidJsonResponse.status).toBe(400);
+  expect(invalidTypeResponse).toMatchInlineSnapshot(`
+    NiceResponse {
+      "status": 400,
+      "body": "[ERROR] auth.oauth.providers.invalid.type must be one of the following values: google, github, microsoft, spotify, facebook, discord, gitlab, bitbucket, linkedin, apple, x, twitch",
+      "headers": Headers { <some fields may have been hidden> },
+    }
+  `);
 });
 
 it("adds, updates, and removes domains", async ({ expect }) => {
diff --git a/packages/stack-shared/src/interface/crud/config.ts b/packages/stack-shared/src/interface/crud/config.ts
index f9cbe3657..d1af15e25 100644
--- a/packages/stack-shared/src/interface/crud/config.ts
+++ b/packages/stack-shared/src/interface/crud/config.ts
@@ -5,7 +5,7 @@ import { yupObject } from "../../schema-fields";
 export const configOverrideCrudAdminReadSchema = yupObject({}).defined();
 
 export const configOverrideCrudAdminUpdateSchema = yupObject({
-  configOverrideString: schemaFields.yupString().optional(),
+  config_override_string: schemaFields.yupString().optional(),
 }).defined();
 
 export const configOverrideCrud = createCrud({
@@ -22,7 +22,7 @@ export const configOverrideCrud = createCrud({
 export type ConfigOverrideCrud = CrudTypeOf<typeof configOverrideCrud>;
 
 export const configCrudAdminReadSchema = yupObject({
-  configString: schemaFields.yupString().defined(),
+  config_string: schemaFields.yupString().defined(),
 }).defined();
 
 export const configCrud = createCrud({