diff --git a/bin/composer b/bin/composer
index cee476b6d..32c45bcda 100755
--- a/bin/composer
+++ b/bin/composer
@@ -65,6 +65,12 @@ if (function_exists('ini_set')) {
     unset($memoryLimit);
 }
 
+// Workaround PHP bug on Windows where env vars containing Unicode chars are mangled in $_SERVER
+// see https://github.com/php/php-src/issues/7896
+if (Platform::isWindows()) {
+    $_SERVER = array_merge($_SERVER, array_intersect_ukey($_SERVER, getenv(), 'strcasecmp'));
+}
+
 Platform::putEnv('COMPOSER_BINARY', realpath($_SERVER['argv'][0]));
 
 ErrorHandler::register();
diff --git a/src/Composer/Console/Application.php b/src/Composer/Console/Application.php
index c138e1e60..4762396af 100644
--- a/src/Composer/Console/Application.php
+++ b/src/Composer/Console/Application.php
@@ -340,7 +340,7 @@ class Application extends BaseApplication
 
             return $result;
         } catch (ScriptExecutionException $e) {
-            return (int) $e->getCode();
+            return $e->getCode();
         } catch (\Exception $e) {
             $ghe = new GithubActionError($this->io);
             $ghe->emit($e->getMessage());
diff --git a/src/Composer/DependencyResolver/SolverProblemsException.php b/src/Composer/DependencyResolver/SolverProblemsException.php
index 27deac4b3..128fbe146 100644
--- a/src/Composer/DependencyResolver/SolverProblemsException.php
+++ b/src/Composer/DependencyResolver/SolverProblemsException.php
@@ -39,14 +39,6 @@ class SolverProblemsException extends \RuntimeException
         parent::__construct('Failed resolving dependencies with '.count($problems).' problems, call getPrettyString to get formatted details', self::ERROR_DEPENDENCY_RESOLUTION_FAILED);
     }
 
-    /**
-     * @return self::ERROR_DEPENDENCY_RESOLUTION_FAILED
-     */
-    public function getExitCode()
-    {
-        return self::ERROR_DEPENDENCY_RESOLUTION_FAILED;
-    }
-
     /**
      * @param bool $isVerbose
      * @param bool $isDevExtraction
diff --git a/src/Composer/Installer.php b/src/Composer/Installer.php
index 78329042d..5b5489d53 100644
--- a/src/Composer/Installer.php
+++ b/src/Composer/Installer.php
@@ -455,7 +455,7 @@ class Installer
             $ghe = new GithubActionError($this->io);
             $ghe->emit($err."\n".$prettyProblem);
 
-            return max(self::ERROR_GENERIC_FAILURE, $e->getExitCode());
+            return max(self::ERROR_GENERIC_FAILURE, $e->getCode());
         }
 
         $this->io->writeError("Analyzed ".count($pool)." packages to resolve dependencies", true, IOInterface::VERBOSE);
@@ -633,7 +633,7 @@ class Installer
             $ghe = new GithubActionError($this->io);
             $ghe->emit($err."\n".$prettyProblem);
 
-            return max(self::ERROR_GENERIC_FAILURE, $e->getExitCode());
+            return $e->getCode();
         }
 
         $lockTransaction->setNonDevPackages($nonDevLockTransaction);
@@ -703,7 +703,7 @@ class Installer
                 $ghe = new GithubActionError($this->io);
                 $ghe->emit($err."\n".$prettyProblem);
 
-                return max(self::ERROR_GENERIC_FAILURE, $e->getExitCode());
+                return max(self::ERROR_GENERIC_FAILURE, $e->getCode());
             }
         }
 
diff --git a/src/Composer/Repository/Vcs/GitLabDriver.php b/src/Composer/Repository/Vcs/GitLabDriver.php
index e775dd269..dd7cb65b2 100644
--- a/src/Composer/Repository/Vcs/GitLabDriver.php
+++ b/src/Composer/Repository/Vcs/GitLabDriver.php
@@ -504,6 +504,11 @@ class GitLabDriver extends VcsDriver
 
                 // force auth as the unauthenticated version of the API is broken
                 if (!isset($json['default_branch'])) {
+                    // GitLab allows you to disable the repository inside a project to use a project only for issues and wiki
+                    if (isset($json['repository_access_level']) && $json['repository_access_level'] === 'disabled') {
+                        throw new TransportException('The GitLab repository is disabled in the project', 400);
+                    }
+
                     if (!empty($json['id'])) {
                         $this->isPrivate = false;
                     }