diff --git a/index.php b/index.php
index ee63cbde29..743bfe7132 100644
--- a/index.php
+++ b/index.php
@@ -272,7 +272,7 @@
 				$rstlog = FroxlorLogger::getInstanceOf([
 					'loginname' => $_SERVER['REMOTE_ADDR']
 				]);
-				$rstlog->logAction(FroxlorLogger::LOGIN_ACTION, LOG_WARNING, "Unknown user '" . $loginname . "' tried to login.");
+				$rstlog->logAction(FroxlorLogger::LOGIN_ACTION, LOG_WARNING, "Unknown user tried to login.");
 
 				Response::redirectTo('index.php', [
 					'showmessage' => '2'
@@ -334,7 +334,7 @@
 			$rstlog = FroxlorLogger::getInstanceOf([
 				'loginname' => $_SERVER['REMOTE_ADDR']
 			]);
-			$rstlog->logAction(FroxlorLogger::LOGIN_ACTION, LOG_WARNING, "User '" . $loginname . "' tried to login with wrong password.");
+			$rstlog->logAction(FroxlorLogger::LOGIN_ACTION, LOG_WARNING, "User tried to login with wrong password.");
 
 			unset($userinfo);
 			Response::redirectTo('index.php', [
@@ -653,7 +653,7 @@
 							$rstlog = FroxlorLogger::getInstanceOf([
 								'loginname' => 'password_reset'
 							]);
-							$rstlog->logAction(FroxlorLogger::USR_ACTION, LOG_WARNING, "User '" . $loginname . "' requested to set a new password, but was not found in database!");
+							$rstlog->logAction(FroxlorLogger::USR_ACTION, LOG_WARNING, "Unknown user requested to set a new password, but was not found in database!");
 							$message = lng('login.usernotfound');
 						}
 
diff --git a/lib/Froxlor/Api/Commands/SysLog.php b/lib/Froxlor/Api/Commands/SysLog.php
index 9236d57772..2df7d1a133 100644
--- a/lib/Froxlor/Api/Commands/SysLog.php
+++ b/lib/Froxlor/Api/Commands/SysLog.php
@@ -90,6 +90,8 @@ public function listing()
 		}
 		Database::pexecute($result_stmt, $query_fields, true, true);
 		while ($row = $result_stmt->fetch(PDO::FETCH_ASSOC)) {
+			// clean log-text
+			$row['text'] = preg_replace("/[^\w @#\"':.()\[\]+\-_\/\\\!]/i", "_", $row['text']);
 			$result[] = $row;
 		}
 		$this->logger()->logAction($this->isAdmin() ? FroxlorLogger::ADM_ACTION : FroxlorLogger::USR_ACTION, LOG_INFO, "[API] list log-entries");
diff --git a/lib/Froxlor/FroxlorLogger.php b/lib/Froxlor/FroxlorLogger.php
index 2ca02aeb08..6eeadf7fdc 100644
--- a/lib/Froxlor/FroxlorLogger.php
+++ b/lib/Froxlor/FroxlorLogger.php
@@ -175,6 +175,9 @@ public function logAction($action = FroxlorLogger::USR_ACTION, int $type = LOG_N
 			$this->initMonolog();
 		}
 
+		// clean log-text
+		$text = preg_replace("/[^\w @#\"':.()\[\]+\-_\/\\\!]/i", "_", $text);
+
 		if (self::$crondebug_flag || ($action == FroxlorLogger::CRON_ACTION && $type <= LOG_WARNING)) {
 			echo "[" . $this->getLogLevelDesc($type) . "] " . $text . PHP_EOL;
 		}