fix(webauthn): Throw on uid mismatch when updating registration

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

Author: come-nc

lib/private/Authentication/WebAuthn/CredentialRepository.php

@@ -61,6 +61,9 @@ public function saveAndReturnCredentialSource(PublicKeyCredentialSource $publicK
 		$entity = PublicKeyCredentialEntity::fromPublicKeyCrendentialSource($name, $publicKeyCredentialSource, $userVerification);
 
 		if ($oldEntity) {
+			if ($oldEntity->getUid() !== $entity->getUid()) {
+				throw new \InvalidArgumentException('Uid mismatch');
+			}
 			$entity->setId($oldEntity->getId());
 			if ($defaultName) {
 				$entity->setName($oldEntity->getName());