diff --git a/build/stubs/app_ecosystem_v2.php b/build/stubs/app_ecosystem_v2.php
new file mode 100644
index 0000000000000..d2b07c9c61628
--- /dev/null
+++ b/build/stubs/app_ecosystem_v2.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace OCA\AppEcosystemV2\Service;
+
+use OCP\IRequest;
+
+class AppEcosystemV2Service {
+	/**
+	 * @param IRequest $request
+	 * @param bool $isDav
+	 *
+	 * @return bool
+	 */
+	public function validateExAppRequestToNC(IRequest $request, bool $isDav = false): bool {}
+}
diff --git a/lib/base.php b/lib/base.php
index 2dd9a4d59f084..b328165fdfabc 100644
--- a/lib/base.php
+++ b/lib/base.php
@@ -1137,6 +1137,9 @@ public static function handleLogin(OCP\IRequest $request): bool {
 		if (OC_User::handleApacheAuth()) {
 			return true;
 		}
+		if (self::tryAppEcosystemV2Login($request)) {
+			return true;
+		}
 		if ($userSession->tryTokenLogin($request)) {
 			return true;
 		}
@@ -1174,6 +1177,22 @@ protected static function handleAuthHeaders(): void {
 			}
 		}
 	}
+
+	protected static function tryAppEcosystemV2Login(OCP\IRequest $request): bool {
+		$appManager = Server::get(OCP\App\IAppManager::class);
+		if (!$request->getHeader('AE-SIGNATURE')) {
+			return false;
+		}
+		if (!$appManager->isInstalled('app_ecosystem_v2')) {
+			return false;
+		}
+		try {
+			$appEcosystemV2Service = Server::get(OCA\AppEcosystemV2\Service\AppEcosystemV2Service::class);
+			return $appEcosystemV2Service->validateExAppRequestToNC($request);
+		} catch (\Psr\Container\NotFoundExceptionInterface|\Psr\Container\ContainerExceptionInterface $e) {
+			return false;
+		}
+	}
 }
 
 OC::init();
diff --git a/psalm.xml b/psalm.xml
index 87cecf3e2d294..cb7409489a827 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -81,6 +81,7 @@
 		<file name="build/stubs/zip.php"/>
 		<file name="build/stubs/psr_container.php"/>
 		<file name="3rdparty/sabre/uri/lib/functions.php" />
+		<file name="build/stubs/app_ecosystem_v2.php" />
 	</stubs>
 	<issueHandlers>
 		<LessSpecificReturnStatement errorLevel="error"/>