CVE-2026-21449: Webkul Bagisto RCE Vulnerability

CVE-2026-21449 Overview

CVE-2026-21449 is a server-side template injection (SSTI) vulnerability affecting Bagisto, an open source Laravel-based eCommerce platform. The vulnerability allows authenticated low-privilege users to inject malicious template code through the first name and last name input fields. Successful exploitation can lead to remote code execution on the server, potentially compromising the entire eCommerce application and underlying infrastructure.

Critical Impact

Low-privilege users can achieve remote code execution through server-side template injection via name fields, potentially compromising the entire eCommerce platform and customer data.

Affected Products

• Webkul Bagisto versions prior to 2.3.10

Discovery Timeline

• 2026-01-02 - CVE CVE-2026-21449 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2026-21449

Vulnerability Analysis

This vulnerability falls under CWE-1336 (Improper Neutralization of Special Elements Used in a Template Engine). The vulnerability exists because Bagisto fails to properly sanitize user-supplied input in the first name and last name fields before passing them to the template engine. Since Bagisto is built on Laravel, it utilizes the Blade templating engine, which if not properly configured, can interpret malicious template directives embedded in user input.

Server-side template injection vulnerabilities are particularly dangerous because they occur on the server rather than the client. When user input is concatenated directly into templates without proper escaping, an attacker can inject template syntax that gets evaluated by the server's template engine. In the context of a Laravel application, this can lead to arbitrary PHP code execution.

The attack requires only low-privilege authentication, meaning any user who can register an account and modify their profile information could potentially exploit this vulnerability. This is significant for eCommerce platforms where customer registration is typically open to the public.

Root Cause

The root cause of this vulnerability is insufficient input validation and sanitization of user-controllable data (first name and last name fields) before the data is processed by the template engine. The application fails to properly escape or neutralize special characters and template directives that could be interpreted as executable code by the Blade template engine.

Attack Vector

The attack vector is network-based and requires low-privilege authentication. An attacker would follow these steps to exploit the vulnerability:

1. Register or log in as a low-privilege user on the Bagisto eCommerce platform
2. Navigate to the profile or account settings where first name and last name can be modified
3. Inject malicious template syntax into the name fields
4. The malicious payload is stored in the database
5. When the application renders a page that displays the user's name using the vulnerable template processing, the injected template code is executed on the server

The vulnerability is particularly concerning because profile names are often displayed across multiple pages and administrative interfaces, potentially triggering the payload in various contexts including when viewed by administrators.

Detection Methods for CVE-2026-21449

Indicators of Compromise

• Unusual template syntax patterns in user profile fields (first name, last name) such as {{, }}, {%, %}, or @php directives
• Unexpected server-side errors or exceptions related to template parsing
• Anomalous outbound network connections from the web server
• Unauthorized file system modifications or new files appearing on the server
• Unusual process execution patterns originating from the web server process

Detection Strategies

• Implement web application firewall (WAF) rules to detect template injection patterns in POST requests to profile update endpoints
• Monitor application logs for template parsing errors or unexpected Blade compilation failures
• Review database records for user profile fields containing template syntax characters or directives
• Deploy runtime application self-protection (RASP) solutions to detect template injection attempts

Monitoring Recommendations

• Enable detailed logging for user profile modification activities
• Monitor for unusual patterns in HTTP request payloads to account management endpoints
• Set up alerts for template engine errors in application logs
• Implement file integrity monitoring on critical server directories

How to Mitigate CVE-2026-21449

Immediate Actions Required

• Upgrade Bagisto to version 2.3.10 or later immediately
• Audit existing user accounts for suspicious content in first name and last name fields
• Review server logs for any signs of exploitation attempts
• Consider temporarily restricting profile editing functionality if immediate patching is not possible

Patch Information

The vulnerability has been fixed in Bagisto version 2.3.10. Organizations running affected versions should upgrade to this version or later as soon as possible. Detailed information about the security fix is available in the GitHub Security Advisory GHSA-mqhg-v22x-pqj8.

Workarounds

• Implement strict input validation on first name and last name fields to reject any template syntax characters
• Apply output encoding when displaying user-supplied content to prevent template interpretation
• Configure the template engine to use auto-escaping for all user-controlled variables
• Use a web application firewall to filter requests containing template injection payloads

# Example: Sanitize user input before storage
# In Laravel, ensure all user input displayed in templates uses proper escaping
# Replace {{ $user->first_name }} with {!! e($user->first_name) !!}
# Or ensure auto-escaping is enabled in Blade templates