CVE-2024-39400 Overview
CVE-2024-39400 is a DOM-based Cross-Site Scripting (XSS) vulnerability affecting Adobe Commerce and Magento Open Source. The flaw allows an authenticated admin attacker to inject arbitrary JavaScript that executes in another admin's browser session. Exploitation requires user interaction, such as convincing a targeted admin to click a crafted link.
Affected releases include Adobe Commerce 2.4.7-p1, 2.4.6-p6, 2.4.5-p8, 2.4.4-p9, and all earlier versions, along with equivalent Magento Open Source builds. The vulnerability is categorized under CWE-79 and carries a scope change because code executes against other admin accounts.
Critical Impact
Successful exploitation lets an attacker hijack privileged admin sessions, exfiltrate store configuration, alter merchant data, and pivot to broader compromise of the storefront backend.
Affected Products
- Adobe Commerce 2.4.7-p1 and earlier 2.4.7 releases (including b1, b2)
- Adobe Commerce 2.4.6-p6, 2.4.5-p8, 2.4.4-p9, and all earlier patched releases in the 2.4.4–2.4.6 branches
- Magento Open Source equivalents across the 2.4.4 through 2.4.7-p1 release lines
Discovery Timeline
- 2024-08-14 - CVE-2024-39400 published to NVD
- 2024-08-14 - Adobe releases security bulletin APSB24-61
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-39400
Vulnerability Analysis
The issue is a DOM-based XSS in the Adobe Commerce admin interface. Client-side JavaScript in the admin UI consumes attacker-controlled input and writes it into the DOM without adequate sanitization or output encoding. Because the injection occurs entirely in the browser, the payload never traverses server-side XSS filters that would normally catch reflected or stored variants.
The scope is marked as changed because a low-privileged admin can affect other admin accounts operating under stricter security boundaries. Confidentiality and integrity impact are both rated high, while availability is unaffected. Adobe classifies the vulnerability under CWE-79, Improper Neutralization of Input During Web Page Generation.
Root Cause
The root cause is unsafe handling of attacker-influenced values within a client-side sink in the Magento admin panel. Values that reach APIs such as innerHTML, document.write, or jQuery HTML insertion helpers are rendered as markup rather than treated as inert text. The absence of contextual output encoding or a strict Content Security Policy allows script content to execute inline.
Attack Vector
Exploitation requires an authenticated attacker with high admin privileges and interaction from a second admin user. The attacker crafts a URL or admin action containing a malicious fragment or parameter. When the victim admin loads the resource, the browser evaluates the injected script under the target's session, granting the attacker full control over that admin's context, including CSRF tokens, session cookies scoped to the admin path, and any actions the victim can perform.
Because the attack vector is network-based and the admin panel is often exposed to the public internet, the payload can be delivered through email, chat, or any medium capable of transmitting a URL. See the Adobe Magento Security Advisory for vendor-confirmed technical scope.
Detection Methods for CVE-2024-39400
Indicators of Compromise
- Admin panel URLs containing suspicious fragment identifiers, encoded <script> tags, or JavaScript event handler attributes such as onerror= or onload=
- Outbound HTTP requests from admin browser sessions to unexpected external hosts shortly after clicking an internal link
- Creation of new admin users, API integrations, or modification of payment configuration immediately following an admin login event
Detection Strategies
- Inspect web server access logs for admin URLs carrying unusual query parameters or fragment payloads containing HTML entities and script keywords
- Correlate admin authentication events with subsequent privileged configuration changes to surface session hijack behavior
- Deploy browser-side Content Security Policy reporting to capture inline script violations from the /admin path
Monitoring Recommendations
- Enable and centralize Magento admin action logs, forwarding them to a SIEM for alerting on privileged changes
- Monitor for anomalous admin_user table modifications and new API keys generated outside change windows
- Alert on admin sessions originating from new IP addresses, ASNs, or geographies inconsistent with staff baselines
How to Mitigate CVE-2024-39400
Immediate Actions Required
- Apply the Adobe security update from bulletin APSB24-61 to move to a patched release
- Restrict access to the Magento admin URL by IP allowlist or VPN to limit exposure of the vulnerable interface
- Rotate admin credentials and invalidate active admin sessions after patching to remove any lingering hijacked sessions
Patch Information
Adobe addressed CVE-2024-39400 in Adobe Commerce and Magento Open Source versions released alongside bulletin APSB24-61 on August 13, 2024. Administrators should upgrade to 2.4.7-p2, 2.4.6-p7, 2.4.5-p9, 2.4.4-p10, or later, per the vendor advisory. Verify installation using bin/magento --version after upgrade and confirm the patch level in the Adobe Commerce admin dashboard.
Workarounds
- Enforce a strict Content Security Policy on the admin path that disallows unsafe-inline scripts to blunt DOM XSS payloads
- Require multi-factor authentication for all admin accounts to reduce the value of a hijacked session
- Apply the principle of least privilege by removing unused admin accounts and limiting role permissions to those strictly required
# Example: renaming the admin path in env.php to reduce exposure
php bin/magento setup:config:set --backend-frontname="admin_$(openssl rand -hex 4)"
php bin/magento cache:flush
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
