CVE-2026-48008: Shopware Privilege Escalation Vulnerability

CVE-2026-48008 Overview

CVE-2026-48008 is a privilege escalation vulnerability in Shopware, an open commerce platform. A non-admin API user holding the integration:create ACL privilege can escalate to full administrator by abusing the Sync API endpoint POST /api/_action/sync. The regular integration endpoint POST /api/integration blocks setting admin: true, but the Sync API path routes writes through SyncService to EntityWriter::upsert(), bypassing that control. The root cause is a missing WriteProtection flag on the admin field in src/Core/Framework/Integration/IntegrationDefinition.php. The issue is fixed in versions 6.6.10.18 and 6.7.10.1.

Critical Impact
An authenticated API user with limited privileges can promote a created integration to administrator, gaining full control over the Shopware instance and its data.

Affected Products

Shopware 6.x versions prior to 6.6.10.18
Shopware 6.7.x versions prior to 6.7.10.1
Shopware deployments exposing the Admin API to integration users

Discovery Timeline

2026-07-17 - CVE-2026-48008 published to NVD
2026-07-17 - Last updated in NVD database

Technical Details for CVE-2026-48008

Vulnerability Analysis

CVE-2026-48008 is an authorization flaw classified as [CWE-862] Missing Authorization. Shopware exposes two ways to create an integration entity. The dedicated endpoint POST /api/integration enforces that the admin boolean cannot be set by non-admin callers. The generic Sync API endpoint POST /api/_action/sync accepts entity writes and dispatches them through SyncController::sync(), which then calls SyncService and ultimately EntityWriter::upsert().

The write pipeline honors field-level flags declared on each EntityDefinition. Because IntegrationDefinition did not mark the admin field with WriteProtected, the Sync API accepted arbitrary values for that field. Any authenticated user with the integration:create ACL right could create an integration with admin: true and then authenticate as that integration to perform administrator-only operations.

Root Cause

The root cause is inconsistent enforcement of privileged field writes across API entry points. The controller-level check on POST /api/integration was not mirrored at the data abstraction layer, and src/Core/Framework/Integration/IntegrationDefinition.php lacked a WriteProtected flag on the admin field. The Sync API therefore bypassed the intended access control.

Attack Vector

The attack requires an authenticated user or OAuth client with the integration:create ACL privilege. The attacker sends a Sync API request that creates or upserts an integration with admin set to true. The attacker then uses the returned integration credentials to obtain an administrator OAuth token and act on the platform without restriction.

php

// Security patch in src/Core/System/Integration/IntegrationDefinition.php
// Adds the WriteProtected flag to guard the admin field via the DAL.

 use Shopware\Core\Framework\Api\Acl\Role\AclRoleDefinition;
 use Shopware\Core\Framework\App\AppDefinition;
+use Shopware\Core\Framework\Context;
 use Shopware\Core\Framework\DataAbstractionLayer\EntityDefinition;
 use Shopware\Core\Framework\DataAbstractionLayer\Field\BoolField;
 use Shopware\Core\Framework\DataAbstractionLayer\Field\CustomFields;
 use Shopware\Core\Framework\DataAbstractionLayer\Field\DateTimeField;
 use Shopware\Core\Framework\DataAbstractionLayer\Field\Flag\PrimaryKey;
 use Shopware\Core\Framework\DataAbstractionLayer\Field\Flag\Required;
 use Shopware\Core\Framework\DataAbstractionLayer\Field\Flag\RestrictDelete;
+use Shopware\Core\Framework\DataAbstractionLayer\Field\Flag\WriteProtected;
 use Shopware\Core\Framework\DataAbstractionLayer\Field\IdField;

Source: Shopware Commit 1e047f6

Detection Methods for CVE-2026-48008

Indicators of Compromise

HTTP requests to POST /api/_action/sync containing an integration entity payload with "admin": true.
New rows in the integration table where admin = 1 created by a non-administrator OAuth client.
OAuth token requests using client credentials for integrations created shortly after a suspicious Sync API call.
Administrative actions performed by an integration that previously held only limited ACL roles.

Detection Strategies

Parse Shopware access logs for Sync API payloads referencing the integration entity and flag any that set the admin field.
Correlate integration:create ACL usage with subsequent privilege-sensitive API activity from the same client.
Baseline the count of admin-enabled integrations and alert on any unexpected increase.

Monitoring Recommendations

Forward Shopware application and web server logs to a central SIEM for query-based hunting.
Enable audit logging on the integration entity to capture writes, actors, and field-level changes.
Review ACL role assignments and remove integration:create from users that do not require it.

How to Mitigate CVE-2026-48008

Immediate Actions Required

Upgrade Shopware to 6.6.10.18 or 6.7.10.1 as documented in the GitHub Security Advisory GHSA-gv8p-48fr-4fxg.
Audit the integration table for entries with admin = 1 and validate each against approved change records.
Rotate credentials for any integration that cannot be positively attributed to an administrator action.
Revoke the integration:create ACL from accounts that do not require integration management.

Patch Information

Shopware released fixed builds in v6.6.10.18 and v6.7.10.1. The fix adds a WriteProtected flag to the admin field in IntegrationDefinition, blocking non-admin contexts from writing that field through the Sync API. See commits 1e047f6 and db5adff.

Workarounds

Restrict access to POST /api/_action/sync at the reverse proxy for non-administrator API clients until patches are applied.
Remove the integration:create ACL privilege from all non-admin roles as a temporary control.
Deploy a web application firewall rule that blocks Sync API payloads containing an integration entity with admin: true.

bash

# Example WAF rule (ModSecurity) to block admin escalation payloads via Sync API
SecRule REQUEST_URI "@streq /api/_action/sync" \
    "chain,phase:2,deny,status:403,id:1002026480,\
    msg:'CVE-2026-48008: Shopware Sync API admin escalation attempt'"
    SecRule REQUEST_BODY "@rx \"entity\"\\s*:\\s*\"integration\".*\"admin\"\\s*:\\s*true" \
        "t:none,t:lowercase"