diff --git a/frontend/src/hooks.server.ts b/frontend/src/hooks.server.ts
index 78c5dae5..37d4823e 100644
--- a/frontend/src/hooks.server.ts
+++ b/frontend/src/hooks.server.ts
@@ -65,6 +65,12 @@ export const handleFetch: HandleFetch = async ({ event, request, fetch }) => {
 	const isApi = request.url.startsWith(apiUrl) || request.url.includes('/api/');
 
 	if (isApi) {
+		// If the request already carries an explicit Authorization header (e.g. the
+		// login action sends Basic auth), pass it through unchanged.
+		if (request.headers.has('Authorization')) {
+			return fetch(request);
+		}
+
 		const token = event.cookies.get('auth_token');
 
 		if (!token) {