CVE-2026-77109: Adobe Commerce Privilege Escalation Flaw

CVE-2026-77109 Overview

CVE-2026-77109 is an Incorrect Authorization vulnerability [CWE-863] affecting Adobe Commerce, Adobe Commerce B2B, and Adobe Magento Open Source. An unauthenticated attacker can exploit the flaw over the network to gain elevated access to restricted resources. The issue does not require user interaction and results in a scope change, meaning the impact extends beyond the vulnerable component. Adobe published guidance in security bulletin APSB26-138.

Critical Impact
Remote, unauthenticated attackers can escalate privileges against Adobe Commerce storefronts and administrative resources, exposing merchant and customer data pipelines to unauthorized modification.

Affected Products

Adobe Commerce (versions 2.4.4 through 2.4.9, including patch releases)
Adobe Commerce B2B (versions 1.3.3 through 1.5.3, including patch releases)
Adobe Magento Open Source (versions 2.4.7 through 2.4.9, including patch releases)

Discovery Timeline

2026-09-08 - CVE-2026-77109 published to the National Vulnerability Database
2026-09-09 - Last updated in NVD database

Technical Details for CVE-2026-77109

Vulnerability Analysis

The flaw is classified under CWE-863: Incorrect Authorization. Adobe Commerce evaluates access decisions incorrectly on a network-reachable code path, allowing an attacker to reach functionality intended for higher-privileged roles. Because the CVSS scope is changed, the vulnerability affects resources managed outside the authorization boundary of the vulnerable component. The primary impact is to integrity, enabling unauthorized modification of protected data or state without breaking confidentiality or availability directly.

Root Cause

The root cause is an authorization check that permits actions the requesting principal should not be able to perform. In practice, this pattern typically arises when a controller, GraphQL resolver, or REST endpoint validates authentication but fails to enforce the correct role, store scope, or resource-owner check before executing privileged logic. The Adobe advisory does not disclose the specific module.

Attack Vector

Exploitation requires only network access to an exposed Adobe Commerce, Commerce B2B, or Magento Open Source instance. No credentials and no user interaction are required. An attacker sends crafted requests to the vulnerable endpoint and receives elevated access to restricted resources, which can be used to alter administrative state or downstream systems reachable from the merchant application.

// No public proof-of-concept has been released for CVE-2026-77109.
// Refer to Adobe Security Bulletin APSB26-138 for vendor-provided details.

Detection Methods for CVE-2026-77109

Indicators of Compromise

Unexpected creation or modification of administrator accounts, integration tokens, or API keys in the Commerce admin.
Requests to /rest/, /graphql, or /admin/ endpoints from unauthenticated sessions that return successful responses for privileged operations.
Configuration or catalog changes performed by service accounts outside normal maintenance windows.

Detection Strategies

Review web server and application logs for anomalous HTTP 200 responses on administrative or B2B endpoints originating from anonymous sessions.
Correlate Adobe Commerce audit log entries with authentication events to identify privileged actions that lack a valid administrative login.
Alert on new admin users, permission role changes, and modifications to core_config_data values related to security or payment configuration.

Monitoring Recommendations

Forward Adobe Commerce, web server, and WAF telemetry into a centralized SIEM for cross-source correlation.
Monitor outbound connections from Commerce hosts for signs of webshell drop or data exfiltration following suspicious requests.
Baseline normal REST and GraphQL request patterns per store view and alert on deviations, particularly bursts against admin-scoped mutations.

How to Mitigate CVE-2026-77109

Immediate Actions Required

Apply the security updates referenced in Adobe Security Bulletin APSB26-138 to all Commerce, Commerce B2B, and Magento Open Source instances.
Restrict network exposure of the Adobe Commerce admin panel using IP allowlists or VPN-only access.
Rotate administrator credentials, integration tokens, and API keys after patching to invalidate any credentials that may have been exposed.

Patch Information

Adobe released fixes for CVE-2026-77109 as part of the APSB26-138 security bulletin. Merchants should upgrade to the fixed release lines identified by Adobe for their deployed 2.4.x branch. Consult the Adobe Magento Security Advisory for the exact fixed versions per product.

Workarounds

If immediate patching is not feasible, place a Web Application Firewall in front of the storefront and admin interfaces and block anonymous requests to sensitive REST, GraphQL, and admin routes.
Enable and enforce two-factor authentication for all administrative accounts to limit follow-on abuse if privileged access is obtained.
Audit and disable unused Commerce modules and integrations to reduce the exposed attack surface.

bash

# Example: restrict access to the Adobe Commerce admin path at the Nginx layer
location ^~ /admin/ {
    allow 203.0.113.0/24;   # corporate egress range
    deny  all;
    try_files $uri $uri/ /index.php$is_args$args;
}