diff --git a/api/src/State/ResetPasswordUpdateProcessor.php b/api/src/State/ResetPasswordUpdateProcessor.php
index 0ba0497c3e..147148a70f 100644
--- a/api/src/State/ResetPasswordUpdateProcessor.php
+++ b/api/src/State/ResetPasswordUpdateProcessor.php
@@ -5,6 +5,7 @@
 use ApiPlatform\Metadata\Operation;
 use ApiPlatform\State\ProcessorInterface;
 use App\DTO\ResetPassword;
+use App\Entity\User;
 use App\Repository\UserRepository;
 use App\Security\ReCaptcha\ReCaptchaWrapper;
 use Doctrine\ORM\EntityManagerInterface;
@@ -46,6 +47,9 @@ public function process($data, Operation $operation, array $uriVariables = [], a
         $passwordHasher = $this->pwHasherFactory->getPasswordHasher($user);
         $user->password = $passwordHasher->hash($data->password);
         $user->passwordResetKeyHash = null;
+        if (User::STATE_REGISTERED === $user->state) {
+            $user->state = User::STATE_ACTIVATED;
+        }
         $this->em->flush();
 
         $data->password = '';
diff --git a/api/tests/Api/ResetPassword/UpdatePasswordTest.php b/api/tests/Api/ResetPassword/UpdatePasswordTest.php
index 435219fbec..b06c6efc94 100644
--- a/api/tests/Api/ResetPassword/UpdatePasswordTest.php
+++ b/api/tests/Api/ResetPassword/UpdatePasswordTest.php
@@ -5,7 +5,10 @@
 use App\Entity\User;
 use App\Security\ReCaptcha\ReCaptchaWrapper;
 use App\Tests\Api\ECampApiTestCase;
+use Doctrine\ORM\NonUniqueResultException;
+use Doctrine\ORM\NoResultException;
 use ReCaptcha\Response;
+use Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface;
 
 /**
  * @internal
@@ -96,6 +99,66 @@ public function testPatchResetPasswordValidatesUnreasonablyLongPassword() {
         ]);
     }
 
+    /**
+     * @throws NonUniqueResultException
+     * @throws TransportExceptionInterface
+     * @throws NoResultException
+     */
+    public function testPatchResetPasswordActivatesUser() {
+        $this->mockRecaptcha();
+        $this->getEntityManager()->createQueryBuilder()
+            ->update(User::class, 'u')
+            ->set('u.state', ':state')
+            ->where('u.id = :id')
+            ->setParameter('state', User::STATE_REGISTERED)
+            ->setParameter('id', $this->user->getId())
+            ->getQuery()
+            ->execute()
+        ;
+
+        $this->client->request(
+            'POST',
+            '/authentication_token',
+            [
+                'json' => [
+                    'identifier' => $this->user->getEmail(),
+                    'password' => 'test',
+                ],
+            ]
+        );
+
+        $this->assertResponseStatusCodeSame(401);
+
+        $newPassword = 'new_password';
+        $this->client->request(
+            'PATCH',
+            '/auth/reset_password/'.$this->passwordResetKey,
+            [
+                'json' => [
+                    'password' => $newPassword,
+                ],
+                'headers' => [
+                    'Content-Type' => 'application/merge-patch+json',
+                ],
+            ]
+        );
+
+        $this->assertResponseStatusCodeSame(200);
+
+        $this->client->request(
+            'POST',
+            '/authentication_token',
+            [
+                'json' => [
+                    'identifier' => $this->user->getEmail(),
+                    'password' => $newPassword,
+                ],
+            ]
+        );
+
+        $this->assertResponseStatusCodeSame(204);
+    }
+
     protected function mockRecaptcha($shouldReturnSuccess = true) {
         $container = static::getContainer();
         $recaptcha = $this->createMock(ReCaptchaWrapper::class);
diff --git a/api/tests/State/ResetPasswordUpdateProcessorTest.php b/api/tests/State/ResetPasswordUpdateProcessorTest.php
index c36eb76b0f..d171061f3b 100644
--- a/api/tests/State/ResetPasswordUpdateProcessorTest.php
+++ b/api/tests/State/ResetPasswordUpdateProcessorTest.php
@@ -9,6 +9,7 @@
 use App\Security\ReCaptcha\ReCaptchaWrapper;
 use App\State\ResetPasswordUpdateProcessor;
 use Doctrine\ORM\EntityManagerInterface;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
 use ReCaptcha\Response;
@@ -144,6 +145,7 @@ public function testUpdateWithCorrectResetKey() {
         ;
         $user = new User();
         $user->passwordResetKeyHash = 'resetKey';
+        $user->state = User::STATE_REGISTERED;
 
         $this->userRepository->expects(self::once())
             ->method('loadUserByIdentifier')
@@ -167,5 +169,42 @@ public function testUpdateWithCorrectResetKey() {
 
         self::assertThat($user->password, self::equalTo(md5('newPassword')));
         self::assertThat($user->passwordResetKeyHash, self::isEmpty());
+        self::assertThat($user->state, self::equalTo(User::STATE_ACTIVATED));
+    }
+
+    #[TestWith([User::STATE_DELETED])]
+    #[TestWith([User::STATE_ACTIVATED])]
+    public function testUpdateWithCorrectResetKeyDoesNotChangeActivatedOrDeletedUsers(string $state) {
+        $this->recaptchaResponse->expects(self::once())
+            ->method('isSuccess')
+            ->willReturn(true)
+        ;
+        $user = new User();
+        $user->passwordResetKeyHash = 'resetKey';
+        $user->state = $state;
+
+        $this->userRepository->expects(self::once())
+            ->method('loadUserByIdentifier')
+            ->with(self::EMAIL)
+            ->willReturn($user)
+        ;
+        $this->pwHasher->expects(self::once())
+            ->method('verify')
+            ->willReturn(true)
+        ;
+        $this->pwHasher->expects(self::once())
+            ->method('hash')
+            ->willReturnCallback(fn ($raw) => md5($raw))
+        ;
+
+        $this->resetPassword->id = base64_encode(self::EMAIL.'#myKey');
+        $this->resetPassword->recaptchaToken = 'token';
+        $this->resetPassword->password = 'newPassword';
+
+        $this->processor->process($this->resetPassword, new Patch());
+
+        self::assertThat($user->password, self::equalTo(md5('newPassword')));
+        self::assertThat($user->passwordResetKeyHash, self::isEmpty());
+        self::assertThat($user->state, self::equalTo($state));
     }
 }