From a9f4342ad2dc9da4848bb9de0868af3940670170 Mon Sep 17 00:00:00 2001
From: anonymoususer72041
 <247563575+anonymoususer72041@users.noreply.github.com>
Date: Wed, 3 Jun 2026 11:27:56 +0200
Subject: [PATCH 1/2] Harden import temporary file handling

---
 modules/import/ImportUI.php | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/modules/import/ImportUI.php b/modules/import/ImportUI.php
index cd3f8afdd..805a5b371 100755
--- a/modules/import/ImportUI.php
+++ b/modules/import/ImportUI.php
@@ -509,7 +509,6 @@ private function onImport()
         }
 
         /* Get file metadata. */
-        $originalFilename = $_FILES['file']['name'];
         $tempFilename     = $_FILES['file']['tmp_name'];
         $contentType      = $_FILES['file']['type'];
         $fileSize         = $_FILES['file']['size'];
@@ -552,14 +551,7 @@ private function onImport()
         @chmod(CATS_TEMP_DIR, 0777);
 
         /* Make a random file name for the file. */
-        if ($dataType != 'Resume')
-        {
-            $randomFile = FileUtility::makeRandomFilename($tempFilename) . '.tmp';
-        }
-        else
-        {
-            $randomFile = $originalFilename;
-        }
+        $randomFile = FileUtility::makeRandomFilename($tempFilename) . '.tmp';
 
         /* Build new path information for the file. */
         $newFileFullPath  = CATS_TEMP_DIR . '/' . $randomFile;
@@ -592,6 +584,16 @@ private function onImport()
                 break;
 
             default:
+                @unlink($newFileFullPath);
+                $validFileIDKey = array_search(
+                    $randomFile,
+                    $_SESSION['CATS']->validImportFileIDs,
+                    true
+                );
+                if ($validFileIDKey !== false)
+                {
+                    unset($_SESSION['CATS']->validImportFileIDs[$validFileIDKey]);
+                }
                 $this->_template->assign(
                     'errorMessage',
                     'No parser exists for the specified data type.'

From ba0acbda81884edf3e0118790558bd4589065ffe Mon Sep 17 00:00:00 2001
From: anonymoususer72041
 <247563575+anonymoususer72041@users.noreply.github.com>
Date: Wed, 3 Jun 2026 11:28:30 +0200
Subject: [PATCH 2/2] Validate staged import file identifiers

---
 modules/import/ImportUI.php | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/modules/import/ImportUI.php b/modules/import/ImportUI.php
index 805a5b371..ee9ebd772 100755
--- a/modules/import/ImportUI.php
+++ b/modules/import/ImportUI.php
@@ -60,6 +60,15 @@ public function __construct()
         $this->_subTabs = array();
     }
 
+    private function isValidImportFileID($fileID)
+    {
+        return $fileID != '' &&
+            $fileID === basename($fileID) &&
+            isset($_SESSION['CATS']->validImportFileIDs) &&
+            is_array($_SESSION['CATS']->validImportFileIDs) &&
+            in_array($fileID, $_SESSION['CATS']->validImportFileIDs, true);
+    }
+
 
     public function handleRequest()
     {
@@ -471,6 +480,19 @@ private function onImport()
         /* If a file was submitted, then the user sent what colums he wanted to use already. */
         if (isset($_POST['fileName']))
         {
+            $fileName = $this->getTrimmedInput('fileName', $_POST);
+            if (!$this->isValidImportFileID($fileName))
+            {
+                $this->_template->assign(
+                    'errorMessage',
+                    'Invalid staged import file.'
+                );
+                $this->import();
+                return;
+            }
+
+            $_POST['fileName'] = $fileName;
+
             if ($_SESSION['CATS']->isDemo())
             {
                 CommonErrors::fatal(COMMONERROR_PERMISSION, $this, 'Demo user can not import data.');
@@ -763,11 +785,20 @@ public function onImportFieldsDelimited()
             CommonErrors::fatal(COMMONERROR_PERMISSION, $this, 'Invalid user level for action.');
         }
 
-        $filePath = CATS_TEMP_DIR . '/' . $_POST['fileName'];
+        $fileName = $this->getTrimmedInput('fileName', $_POST);
+        if (!$this->isValidImportFileID($fileName))
+        {
+            $this->_template->assign('errorMessage', 'Invalid staged import file.');
+            $this->import();
+            return;
+        }
+
+        $filePath = CATS_TEMP_DIR . '/' . $fileName;
         if (!is_file($filePath))
         {
             $this->_template->assign('errorMessage', 'Invalid filename. (Internal error)');
             $this->import();
+            return;
         }
 
         $dataContaining = $this->getTrimmedInput('dataContaining', $_POST);