CVE-2026-21295: Adobe Commerce Open Redirect Vulnerability

CVE-2026-21295 Overview

CVE-2026-21295 is an Open Redirect vulnerability (CWE-601) affecting Adobe Commerce, Adobe Commerce B2B, and Adobe Magento Open Source. This vulnerability allows an attacker to craft malicious URLs that redirect users from the legitimate e-commerce platform to untrusted external websites. The attack requires user interaction, as victims must click on the specially crafted link.

Critical Impact

Attackers can leverage this vulnerability to redirect e-commerce customers to phishing sites, credential harvesting pages, or malware distribution endpoints, potentially compromising customer data and damaging brand reputation.

Affected Products

• Adobe Commerce versions 2.4.9-alpha3, 2.4.8-p3, 2.4.7-p8, 2.4.6-p13, 2.4.5-p15, 2.4.4-p16 and earlier
• Adobe Commerce B2B versions 1.5.3-alpha3, 1.5.2-p3, 1.4.2-p8, 1.3.5-p13, 1.3.4-p15, 1.3.3-p16 and earlier
• Adobe Magento Open Source versions 2.4.9-alpha3, 2.4.8-p3, 2.4.7-p8, 2.4.6-p13, 2.4.5-p15 and earlier

Discovery Timeline

• 2026-03-11 - CVE-2026-21295 published to NVD
• 2026-03-11 - Last updated in NVD database

Technical Details for CVE-2026-21295

Vulnerability Analysis

The Open Redirect vulnerability in Adobe Commerce stems from insufficient validation of URL redirect parameters within the application. When the platform processes redirect requests, it fails to properly verify that the target URL belongs to a trusted domain. This allows attackers to construct URLs that appear to originate from the legitimate Adobe Commerce storefront but redirect users to arbitrary external destinations.

The vulnerability requires user interaction to exploit, meaning victims must actively click on the malicious link. While this limits the severity compared to zero-click exploits, the impact remains significant in e-commerce contexts where customers regularly interact with links from their trusted merchants.

Root Cause

The root cause is improper URL validation in the redirect handling mechanism. The application does not adequately sanitize or validate the destination parameter in redirect URLs, allowing external URLs to be specified. This is a classic example of CWE-601 (URL Redirection to Untrusted Site), where the application accepts user-controlled input to redirect users without sufficient validation that the destination is safe and expected.

Attack Vector

The attack is network-based and requires an attacker to distribute malicious links to potential victims. A typical attack scenario involves:

1. The attacker identifies a vulnerable redirect endpoint within the Adobe Commerce installation
2. The attacker crafts a URL that appears to be hosted on the legitimate store domain but contains a redirect parameter pointing to a malicious site
3. The malicious link is distributed via phishing emails, social media, or injected into third-party sites
4. When a victim clicks the link, they are first directed to the legitimate Adobe Commerce site, which then immediately redirects them to the attacker-controlled destination
5. The victim may not notice the redirect, as the initial URL appeared trustworthy

This technique is commonly used in phishing campaigns to bypass email security filters and user suspicion, as the visible URL domain appears legitimate.

Detection Methods for CVE-2026-21295

Indicators of Compromise

• Unexpected redirect parameters in Adobe Commerce URLs pointing to external domains
• Web server logs showing redirect requests to unusual or suspicious external URLs
• Customer reports of being redirected away from the storefront to unfamiliar websites

Detection Strategies

• Monitor web application logs for redirect endpoint usage with external URL parameters
• Implement Content Security Policy headers to restrict redirect destinations
• Deploy Web Application Firewall (WAF) rules to detect and block open redirect attempts

Monitoring Recommendations

• Review server access logs for patterns of redirect abuse targeting your Adobe Commerce instance
• Set up alerts for high volumes of redirect requests to external domains
• Monitor customer support channels for reports of suspicious redirect behavior

How to Mitigate CVE-2026-21295

Immediate Actions Required

• Update Adobe Commerce, Commerce B2B, and Magento Open Source to the latest patched versions
• Review web server logs to identify any potential exploitation attempts
• Implement WAF rules to block redirect requests containing external URLs
• Educate customers to verify URL destinations before entering credentials

Patch Information

Adobe has released security updates addressing this vulnerability as documented in Adobe Security Advisory APSB26-05. Organizations should apply the appropriate patches based on their installed version:

• Adobe Commerce: Update to versions newer than 2.4.9-alpha3, 2.4.8-p3, 2.4.7-p8, 2.4.6-p13, 2.4.5-p15, or 2.4.4-p16
• Adobe Commerce B2B: Update to versions newer than 1.5.3-alpha3, 1.5.2-p3, 1.4.2-p8, 1.3.5-p13, 1.3.4-p15, or 1.3.3-p16
• Adobe Magento Open Source: Update to the latest available patched version

Workarounds

• Implement server-side URL validation for all redirect endpoints to restrict redirects to a whitelist of trusted domains
• Deploy a Web Application Firewall (WAF) with rules to detect and block open redirect patterns
• Configure Content Security Policy headers to limit redirect destinations

# Example Apache configuration to restrict redirects
# Add to .htaccess or Apache configuration
<IfModule mod_rewrite.c>
    RewriteEngine On
    # Block redirects to external domains
    RewriteCond %{QUERY_STRING} (^|&)redirect_url=https?://(?!yourdomain\.com) [NC]
    RewriteRule .* - [F,L]
</IfModule>