diff --git a/src/app/auth/resource/[resourceGuid]/page.tsx b/src/app/auth/resource/[resourceGuid]/page.tsx
index 4d6f101de..7f2ad6a27 100644
--- a/src/app/auth/resource/[resourceGuid]/page.tsx
+++ b/src/app/auth/resource/[resourceGuid]/page.tsx
@@ -122,11 +122,20 @@ export default async function ResourceAuthPage(props: {
 
     if (searchParams.redirect) {
         try {
+            const redirectTarget = new URL(searchParams.redirect);
             const serverResourceHost = new URL(authInfo.url).host;
-            const redirectHost = new URL(searchParams.redirect).host;
-            const redirectPort = new URL(searchParams.redirect).port;
+            const redirectHost = redirectTarget.host;
+            const redirectPort = redirectTarget.port;
             const serverResourceHostWithPort = `${serverResourceHost}:${redirectPort}`;
 
+            // URL parses a host out of any scheme that uses "//", so a target
+            // like javascript://resource-host/... matches the comparisons
+            // below. The target is later assigned to window.location, so only
+            // http(s) is accepted here.
+            const isHttpTarget =
+                redirectTarget.protocol === "http:" ||
+                redirectTarget.protocol === "https:";
+
             const wildcardMatchesRedirect = (
                 wildcardDomain: string,
                 host: string
@@ -136,14 +145,16 @@ export default async function ResourceAuthPage(props: {
                 return host.endsWith(suffix) && host.length > suffix.length;
             };
 
-            if (serverResourceHost === redirectHost) {
-                redirectUrl = searchParams.redirect;
-            } else if (serverResourceHostWithPort === redirectHost) {
-                redirectUrl = searchParams.redirect;
-            } else if (
-                authInfo.wildcard &&
-                authInfo.fullDomain &&
-                wildcardMatchesRedirect(authInfo.fullDomain, redirectHost)
+            if (
+                isHttpTarget &&
+                (serverResourceHost === redirectHost ||
+                    serverResourceHostWithPort === redirectHost ||
+                    (authInfo.wildcard &&
+                        authInfo.fullDomain &&
+                        wildcardMatchesRedirect(
+                            authInfo.fullDomain,
+                            redirectHost
+                        )))
             ) {
                 redirectUrl = searchParams.redirect;
             }