diff --git a/.env.example b/.env.example
index af492e576..7d20152d7 100644
--- a/.env.example
+++ b/.env.example
@@ -54,6 +54,7 @@ SSL_ENABLED=true
 DB_LOG_ENABLED=true
 ACCESS_TOKEN_CACHE_LIFETIME=300
 API_RESPONSE_CACHE_LIFETIME=600
+CACHE_API_RESPONSE_API_ENDPOINT_LIFETIME=3600
 
 LOG_EMAIL_TO=smarcet@gmail.com
 LOG_EMAIL_FROM=smarcet@gmail.com
diff --git a/app/Http/Middleware/OAuth2BearerAccessTokenRequestValidator.php b/app/Http/Middleware/OAuth2BearerAccessTokenRequestValidator.php
index 502bb64eb..255d26642 100644
--- a/app/Http/Middleware/OAuth2BearerAccessTokenRequestValidator.php
+++ b/app/Http/Middleware/OAuth2BearerAccessTokenRequestValidator.php
@@ -14,6 +14,8 @@
 use App\Models\ResourceServer\IAccessTokenService;
 use App\Models\ResourceServer\IApiEndpointRepository;
 use Closure;
+use Illuminate\Support\Facades\Cache;
+use Illuminate\Support\Facades\Config;
 use Illuminate\Support\Facades\Log;
 use Illuminate\Support\Facades\Request;
 use Illuminate\Support\Facades\Response;
@@ -33,6 +35,7 @@
  */
 class OAuth2BearerAccessTokenRequestValidator
 {
+    const EndpointCacheVersionKey = 'api_endpoint_cache_version';
 
     /**
      * @var IResourceServerContext
@@ -70,6 +73,60 @@ public function __construct(
         $this->token_service       = $token_service;
     }
 
+    /**
+     * Invalidates every cached endpoint lookup (call it after endpoints or scopes change).
+     */
+    public static function flushEndpointCache(): void
+    {
+        Cache::forever(self::EndpointCacheVersionKey, uniqid());
+    }
+
+    /**
+     * Only what the validator needs from the endpoint, cached per (route, method).
+     * Unknown endpoints are cached as missing.
+     *
+     * @param string $route
+     * @param string $method
+     * @return array{exists: bool, active: bool, scopes: string[]}
+     */
+    private function getEndpointInfo(string $route, string $method): array
+    {
+        $loader = function () use ($route, $method): array {
+            $endpoint = $this->endpoint_repository->getApiEndpointByUrlAndMethod($route, $method);
+            if (is_null($endpoint)) {
+                return ['exists' => false, 'active' => false, 'scopes' => []];
+            }
+            return [
+                'exists' => true,
+                'active' => $endpoint->isActive(),
+                'scopes' => $endpoint->getScopesNames(),
+            ];
+        };
+
+        $lifetime = intval(Config::get('cache_api_response.api_endpoint_lifetime', 3600));
+        if ($lifetime <= 0) {
+            return $loader();
+        }
+
+        // a missing version (cache cleared or evicted) gets a fresh one, so entries cached under
+        // a previous version are never read again
+        $version = Cache::get(self::EndpointCacheVersionKey);
+        if (is_null($version)) {
+            Cache::add(self::EndpointCacheVersionKey, uniqid('', true));
+            $version = Cache::get(self::EndpointCacheVersionKey);
+        }
+
+        $key = sprintf
+        (
+            'api_endpoint_%s_%s_%s',
+            $version,
+            $route,
+            $method
+        );
+
+        return Cache::remember($key, $lifetime, $loader);
+    }
+
     /**
      * @param \Illuminate\Http\Request $request
      * @param Closure $next
@@ -131,10 +188,10 @@ public function handle($request, Closure $next)
                 );
             }
 
-            $endpoint = $this->endpoint_repository->getApiEndpointByUrlAndMethod($route, $method);
+            $endpoint = $this->getEndpointInfo($route, $method);
 
             //api endpoint must be registered on db and active
-            if (is_null($endpoint) || !$endpoint->isActive()) {
+            if (!$endpoint['exists'] || !$endpoint['active']) {
                 Log::warning
                 (
                     sprintf('OAuth2BearerAccessTokenRequestValidator::handle API endpoint does not exits! (%s:%s)', $route, $method)
@@ -184,7 +241,7 @@ public function handle($request, Closure $next)
             }
             //check scopes
             Log::debug('OAuth2BearerAccessTokenRequestValidator::handle checking token scopes ...');
-            $endpoint_scopes = $endpoint->getScopesNames();
+            $endpoint_scopes = $endpoint['scopes'];
             Log::debug(sprintf("OAuth2BearerAccessTokenRequestValidator::handle endpoint scopes %s", implode(' ',$endpoint_scopes)));
             Log::debug(sprintf("OAuth2BearerAccessTokenRequestValidator::handle token scopes %s", $token_info->getScope()));
             $token_scopes = explode(' ', $token_info->getScope());
diff --git a/config/cache_api_response.php b/config/cache_api_response.php
index cb728400e..72aee5449 100644
--- a/config/cache_api_response.php
+++ b/config/cache_api_response.php
@@ -20,4 +20,6 @@
     'get_summits_response_lifetime'         => env('CACHE_API_RESPONSE_GET_SUMMITS_LIFETIME', 600),
     'file_url_lifetime'                     => env('CACHE_API_RESPONSE_FILE_URL_LIFETIME', 3600),
     'event_has_access_lifetime'             => env('CACHE_API_RESPONSE_EVENT_HAS_ACCESS_LIFETIME', 600),
+    // 0 disables the cache of the endpoint lookup done by the bearer token validator
+    'api_endpoint_lifetime'                 => env('CACHE_API_RESPONSE_API_ENDPOINT_LIFETIME', 3600),
 ];
\ No newline at end of file
diff --git a/database/migrations/config/APIEndpointsMigrationHelper.php b/database/migrations/config/APIEndpointsMigrationHelper.php
index 32ad97dd6..7a099fe45 100644
--- a/database/migrations/config/APIEndpointsMigrationHelper.php
+++ b/database/migrations/config/APIEndpointsMigrationHelper.php
@@ -30,6 +30,11 @@
  *           $this->addSql($this->insertEndpointAuthzGroup('summits', $endpointName, $groupSlug));
  *       }
  *   }
+ *
+ * Note: the bearer token validator caches the endpoint lookup (cache_api_response.api_endpoint_lifetime).
+ * A deploy running these migrations must flush it (php artisan cache:clear, or
+ * OAuth2BearerAccessTokenRequestValidator::flushEndpointCache()), otherwise new routes
+ * answer 400 until the lifetime expires.
  */
 trait APIEndpointsMigrationHelper
 {
diff --git a/database/seeders/ApiEndpointsSeeder.php b/database/seeders/ApiEndpointsSeeder.php
index af083c4c3..91de62e74 100644
--- a/database/seeders/ApiEndpointsSeeder.php
+++ b/database/seeders/ApiEndpointsSeeder.php
@@ -22,6 +22,7 @@
 use App\Security\OrganizationScopes;
 use App\Security\MemberScopes;
 use App\Models\Foundation\Main\IGroup;
+use App\Http\Middleware\OAuth2BearerAccessTokenRequestValidator;
 use App\Security\CompanyScopes;
 use App\Security\SponsoredProjectScope;
 
@@ -50,6 +51,8 @@ public function run()
         $this->seedSummitMediaFileTypeEndpoints();
         $this->seedElectionsEndpoints();
         $this->seedRSVPInvitationsEndpoints();
+        // endpoints/scopes changed, drop the validator lookups cached by route and method
+        OAuth2BearerAccessTokenRequestValidator::flushEndpointCache();
     }
 
     private function seedAttendeeBadgesEndpoints()
diff --git a/tests/OAuth2BearerEndpointCacheTest.php b/tests/OAuth2BearerEndpointCacheTest.php
new file mode 100644
index 000000000..5ba321212
--- /dev/null
+++ b/tests/OAuth2BearerEndpointCacheTest.php
@@ -0,0 +1,149 @@
+<?php namespace Tests;
+/**
+ * Copyright 2026 OpenStack Foundation
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+
+use App\Http\Middleware\OAuth2BearerAccessTokenRequestValidator;
+use App\Models\ResourceServer\ApiEndpoint;
+use App\Models\ResourceServer\IAccessTokenService;
+use App\Models\ResourceServer\IApiEndpointRepository;
+use Illuminate\Support\Facades\Cache;
+use Illuminate\Support\Facades\Config;
+use models\oauth2\IResourceServerContext;
+use Mockery;
+
+/**
+ * Class OAuth2BearerEndpointCacheTest
+ * Covers the cache of the endpoint lookup done by the bearer token validator.
+ */
+class OAuth2BearerEndpointCacheTest extends TestCase
+{
+    private const Route  = '/api/v1/summits/{id}';
+    private const Method = 'GET';
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        Config::set('cache.default', 'array');
+        Cache::flush();
+        Config::set('cache_api_response.api_endpoint_lifetime', 3600);
+    }
+
+    protected function tearDown(): void
+    {
+        Cache::flush();
+        Mockery::close();
+        parent::tearDown();
+    }
+
+    private function endpoint(bool $active, array $scopes): ApiEndpoint
+    {
+        $endpoint = Mockery::mock(ApiEndpoint::class);
+        $endpoint->shouldReceive('isActive')->andReturn($active);
+        $endpoint->shouldReceive('getScopesNames')->andReturn($scopes);
+        return $endpoint;
+    }
+
+    private function lookup($repository): array
+    {
+        $validator = new OAuth2BearerAccessTokenRequestValidator(
+            Mockery::mock(IResourceServerContext::class),
+            $repository,
+            Mockery::mock(IAccessTokenService::class)
+        );
+        $m = new \ReflectionMethod($validator, 'getEndpointInfo');
+        $m->setAccessible(true);
+        return $m->invoke($validator, self::Route, self::Method);
+    }
+
+    public function testCacheMissPopulatesAndHitSkipsRepository(): void
+    {
+        $repo = Mockery::mock(IApiEndpointRepository::class);
+        $repo->shouldReceive('getApiEndpointByUrlAndMethod')
+            ->once()
+            ->with(self::Route, self::Method)
+            ->andReturn($this->endpoint(true, ['scope-a', 'scope-b']));
+
+        $expected = ['exists' => true, 'active' => true, 'scopes' => ['scope-a', 'scope-b']];
+        $this->assertSame($expected, $this->lookup($repo));
+        $this->assertSame($expected, $this->lookup($repo));
+    }
+
+    public function testInactiveEndpointIsReportedInactive(): void
+    {
+        $repo = Mockery::mock(IApiEndpointRepository::class);
+        $repo->shouldReceive('getApiEndpointByUrlAndMethod')
+            ->once()
+            ->andReturn($this->endpoint(false, ['scope-a']));
+
+        $this->assertFalse($this->lookup($repo)['active']);
+        $this->assertFalse($this->lookup($repo)['active']);
+    }
+
+    public function testUnknownEndpointIsCachedAsMissing(): void
+    {
+        $repo = Mockery::mock(IApiEndpointRepository::class);
+        $repo->shouldReceive('getApiEndpointByUrlAndMethod')->once()->andReturn(null);
+
+        $this->assertFalse($this->lookup($repo)['exists']);
+        $this->assertFalse($this->lookup($repo)['exists']);
+    }
+
+    public function testLifetimeZeroDisablesCache(): void
+    {
+        Config::set('cache_api_response.api_endpoint_lifetime', 0);
+        $repo = Mockery::mock(IApiEndpointRepository::class);
+        $repo->shouldReceive('getApiEndpointByUrlAndMethod')
+            ->twice()
+            ->andReturn($this->endpoint(true, ['scope-a']));
+
+        $this->lookup($repo);
+        $this->lookup($repo);
+        $this->addToAssertionCount(Mockery::getContainer()->mockery_getExpectationCount());
+    }
+
+    public function testMissingVersionIsPersistedAndNotReused(): void
+    {
+        $repo = Mockery::mock(IApiEndpointRepository::class);
+        $repo->shouldReceive('getApiEndpointByUrlAndMethod')
+            ->twice()
+            ->andReturn($this->endpoint(true, ['scope-a']));
+
+        $this->assertNull(Cache::get(OAuth2BearerAccessTokenRequestValidator::EndpointCacheVersionKey));
+        $this->lookup($repo);
+        $version = Cache::get(OAuth2BearerAccessTokenRequestValidator::EndpointCacheVersionKey);
+        $this->assertNotNull($version);
+        $this->assertNotSame('0', $version);
+
+        // the version is evicted: entries cached under it must not be served again
+        Cache::forget(OAuth2BearerAccessTokenRequestValidator::EndpointCacheVersionKey);
+        $this->lookup($repo);
+        $this->assertNotSame(
+            $version,
+            Cache::get(OAuth2BearerAccessTokenRequestValidator::EndpointCacheVersionKey)
+        );
+        $this->addToAssertionCount(Mockery::getContainer()->mockery_getExpectationCount());
+    }
+
+    public function testFlushForcesNewLookup(): void
+    {
+        $repo = Mockery::mock(IApiEndpointRepository::class);
+        $repo->shouldReceive('getApiEndpointByUrlAndMethod')
+            ->twice()
+            ->andReturn($this->endpoint(true, ['scope-a']));
+
+        $this->lookup($repo);
+        OAuth2BearerAccessTokenRequestValidator::flushEndpointCache();
+        $this->lookup($repo);
+        $this->addToAssertionCount(Mockery::getContainer()->mockery_getExpectationCount());
+    }
+}