diff --git a/docs/releases.md b/docs/releases.md
index 2354f8ee..498266ea 100644
--- a/docs/releases.md
+++ b/docs/releases.md
@@ -2,7 +2,7 @@
 Binaries for all releases can be found on the GitHub releases pages for the [ntfy server](https://github.com/binwiederhier/ntfy/releases)
 and the [ntfy Android app](https://github.com/binwiederhier/ntfy-android/releases).
 
-## ntfy server v2.0.2 (UNRELEASED)
+## ntfy server v2.1.0 (UNRELEASED)
 
 **Features:**
 
@@ -13,6 +13,7 @@ and the [ntfy Android app](https://github.com/binwiederhier/ntfy-android/release
 **Bug fixes + maintenance:**
 
 * Web: Do not disable "Reserve topic" checkbox for admins (no ticket, thanks to @xenrox for reporting)
+* UnifiedPush: Treat non-Basic/Bearer `Authorization` header like header was not sent ([#629](https://github.com/binwiederhier/ntfy/issues/629), thanks to [@Boebbele](https://github.com/Boebbele) and [@S1m](https://github.com/S1m) for reporting)
 
 **Additional languages:**
 
diff --git a/server/server.go b/server/server.go
index c4e07238..10b63607 100644
--- a/server/server.go
+++ b/server/server.go
@@ -1505,7 +1505,8 @@ func (s *Server) autorizeTopic(next handleFunc, perm user.Permission) handleFunc
 // maybeAuthenticate reads the "Authorization" header and will try to authenticate the user
 // if it is set.
 //
-//   - If the header is not set, an IP-based visitor is returned
+//   - If the header is not set or not supported (anything non-Basic and non-Bearer),
+//     an IP-based visitor is returned
 //   - If the header is set, authenticate will be called to check the username/password (Basic auth),
 //     or the token (Bearer auth), and read the user from the database
 //
@@ -1518,7 +1519,7 @@ func (s *Server) maybeAuthenticate(r *http.Request) (*visitor, error) {
 	header, err := readAuthHeader(r)
 	if err != nil {
 		return vip, err
-	} else if header == "" {
+	} else if !supportedAuthHeader(header) {
 		return vip, nil
 	} else if s.userManager == nil {
 		return vip, errHTTPUnauthorized
@@ -1563,6 +1564,14 @@ func readAuthHeader(r *http.Request) (string, error) {
 	return value, nil
 }
 
+// supportedAuthHeader returns true only if the Authorization header value starts
+// with "Basic" or "Bearer". In particular, an empty value is not supported, and neither
+// are things like "WebPush", or "vapid" (see #629).
+func supportedAuthHeader(value string) bool {
+	value = strings.ToLower(value)
+	return strings.HasPrefix(value, "basic ") || strings.HasPrefix(value, "bearer ")
+}
+
 func (s *Server) authenticateBasicAuth(r *http.Request, value string) (user *user.User, err error) {
 	r.Header.Set("Authorization", value)
 	username, password, ok := r.BasicAuth()
diff --git a/server/server_test.go b/server/server_test.go
index 4abff399..fddfbba4 100644
--- a/server/server_test.go
+++ b/server/server_test.go
@@ -796,6 +796,25 @@ func TestServer_Auth_ViaQuery(t *testing.T) {
 	require.Equal(t, 401, response.Code)
 }
 
+func TestServer_Auth_NonBasicHeader(t *testing.T) {
+	s := newTestServer(t, newTestConfigWithAuthFile(t))
+
+	response := request(t, s, "PUT", "/mytopic", "test", map[string]string{
+		"Authorization": "WebPush not-supported",
+	})
+	require.Equal(t, 200, response.Code)
+
+	response = request(t, s, "PUT", "/mytopic", "test", map[string]string{
+		"Authorization": "Bearer supported",
+	})
+	require.Equal(t, 401, response.Code)
+
+	response = request(t, s, "PUT", "/mytopic", "test", map[string]string{
+		"Authorization": "basic supported",
+	})
+	require.Equal(t, 401, response.Code)
+}
+
 func TestServer_StatsResetter(t *testing.T) {
 	// This tests the stats resetter for
 	// - an anonymous user