diff --git a/src/Core/Cache/DefaultCacheFactory.php b/src/Core/Cache/DefaultCacheFactory.php
index 9fe65dc72e4..b82d6f08a2b 100644
--- a/src/Core/Cache/DefaultCacheFactory.php
+++ b/src/Core/Cache/DefaultCacheFactory.php
@@ -106,7 +106,9 @@ protected function isAPCUSupported()
         static $apcuSupported = null;
         if (null === $apcuSupported) {
             // Need to check for CLI because Symfony won't: https://github.com/symfony/symfony/pull/25080
-            $apcuSupported = Director::is_cli() ? ini_get('apc.enable_cli') && ApcuAdapter::isSupported() : ApcuAdapter::isSupported();
+            $apcuSupported = Director::is_cli()
+                ? filter_var(ini_get('apc.enable_cli'), FILTER_VALIDATE_BOOL) && ApcuAdapter::isSupported()
+                : ApcuAdapter::isSupported();
         }
         return $apcuSupported;
     }
diff --git a/src/Dev/DebugView.php b/src/Dev/DebugView.php
index 5c380a7bf6f..4e5c4bc87a5 100644
--- a/src/Dev/DebugView.php
+++ b/src/Dev/DebugView.php
@@ -216,7 +216,7 @@ public function renderError($httpRequest, $errno, $errstr, $errfile, $errline)
     {
         $errorType = isset(self::$error_types[$errno]) ? self::$error_types[$errno] : self::$unknown_error;
         $httpRequestEnt = htmlentities($httpRequest ?? '', ENT_COMPAT, 'UTF-8');
-        if (ini_get('html_errors')) {
+        if (filter_var(ini_get('html_errors'), FILTER_VALIDATE_BOOL)) {
             $errstr = strip_tags($errstr ?? '');
         } else {
             $errstr = Convert::raw2xml($errstr);