diff --git a/Sources/AppAuth/iOS/OIDExternalUserAgentIOS.h b/Sources/AppAuth/iOS/OIDExternalUserAgentIOS.h
index 4ab6c7452..58a4f48cd 100644
--- a/Sources/AppAuth/iOS/OIDExternalUserAgentIOS.h
+++ b/Sources/AppAuth/iOS/OIDExternalUserAgentIOS.h
@@ -41,7 +41,7 @@ API_UNAVAILABLE(macCatalyst)
 /*! @brief The designated initializer.
     @param presentingViewController The view controller from which to present the authentication UI.
     @discussion The specific authentication UI used depends on the iOS version and accessibility
-        options. iOS 12+ uses @c ASWebAuthenticationSession (unless Guided Access is on),
+        options. iOS 12+ uses @c ASWebAuthenticationSession (unless Guided Access or Assistive Access is on),
         otherwise local browser is used.
  */
 - (nullable instancetype)initWithPresentingViewController:
@@ -52,7 +52,7 @@ API_UNAVAILABLE(macCatalyst)
     @param presentingViewController The view controller from which to present the browser.
     @param prefersEphemeralSession Whether the caller prefers to use a private authentication
         session. See @c ASWebAuthenticationSession.prefersEphemeralWebBrowserSession for more.
-    @discussion Authentication is performed with @c ASWebAuthenticationSession (unless Guided Access
+    @discussion Authentication is performed with @c ASWebAuthenticationSession (unless Guided Access or Assistive Access
         is on), setting the ephemerality based on the argument.
  */
 - (nullable instancetype)initWithPresentingViewController:
diff --git a/Sources/AppAuth/iOS/OIDExternalUserAgentIOS.m b/Sources/AppAuth/iOS/OIDExternalUserAgentIOS.m
index 7a3fa2278..321ee9a3b 100644
--- a/Sources/AppAuth/iOS/OIDExternalUserAgentIOS.m
+++ b/Sources/AppAuth/iOS/OIDExternalUserAgentIOS.m
@@ -24,6 +24,7 @@
 
 #import <SafariServices/SafariServices.h>
 #import <AuthenticationServices/AuthenticationServices.h>
+#import <Accessibility/Accessibility.h>
 
 #import "OIDErrorUtilities.h"
 #import "OIDExternalUserAgentSession.h"
@@ -99,8 +100,12 @@ - (BOOL)presentExternalUserAgentRequest:(id<OIDExternalUserAgentRequest>)request
 
   // iOS 12 and later, use ASWebAuthenticationSession
   if (@available(iOS 12.0, *)) {
-    // ASWebAuthenticationSession doesn't work with guided access (rdar://40809553)
-    if (!UIAccessibilityIsGuidedAccessEnabled()) {
+    BOOL assistiveAccessEnabled = NO;
+    if (@available(iOS 18.0, *)) {
+      assistiveAccessEnabled = AXAssistiveAccessEnabled();
+    }
+    // ASWebAuthenticationSession doesn't work with guided access (rdar://40809553) or assistive access
+    if (!UIAccessibilityIsGuidedAccessEnabled() && !assistiveAccessEnabled) {
       __weak OIDExternalUserAgentIOS *weakSelf = self;
       NSString *redirectScheme = request.redirectScheme;
       ASWebAuthenticationSession *authenticationVC =