CVE-2026-25878: FroshAdminer Auth Bypass Vulnerability

CVE-2026-25878 Overview

CVE-2026-25878 is an authentication bypass vulnerability affecting FroshAdminer, the Adminer plugin for Shopware Platform. Prior to version 2.2.1, the Adminer route (/admin/adminer) was accessible without Shopware admin authentication. The route was configured with auth_required=false and performed no session validation, exposing the Adminer UI to unauthenticated users.

Critical Impact

Unauthenticated attackers can access the Adminer database management interface, potentially leading to unauthorized database access, data exfiltration, or manipulation of the Shopware e-commerce platform's underlying data.

Affected Products

• FroshPlatformAdminer versions prior to 2.2.1
• Shopware Platform installations with the FroshAdminer plugin enabled
• E-commerce deployments using Adminer for database management

Discovery Timeline

• 2026-02-09 - CVE CVE-2026-25878 published to NVD
• 2026-02-09 - Last updated in NVD database

Technical Details for CVE-2026-25878

Vulnerability Analysis

This vulnerability stems from a missing authentication check (CWE-306) on the Adminer administrative route within the FroshPlatformAdminer plugin. The /admin/adminer endpoint was incorrectly configured to allow access without requiring valid Shopware administrator credentials. Since Adminer provides a full-featured database management interface, this misconfiguration allows unauthenticated users to potentially interact with the backend database powering the Shopware e-commerce platform.

The exploitation of this vulnerability is straightforward—an attacker simply needs to navigate to the /admin/adminer endpoint on a vulnerable Shopware installation. No special tools or techniques are required, making this a low-complexity attack that can be executed by any network-accessible attacker.

Root Cause

The root cause is the improper configuration of the Adminer route with auth_required=false and the absence of session validation logic. The plugin did not enforce authenticated session verification before rendering the Adminer UI, effectively bypassing the Shopware admin authentication layer entirely.

Attack Vector

The attack vector is network-based, requiring no authentication, privileges, or user interaction. An attacker can directly access the vulnerable endpoint from any network location that can reach the Shopware admin interface. Once accessed, the attacker gains visibility into the Adminer database management UI, which could enable further attacks such as SQL manipulation, data theft, or privilege escalation within the e-commerce platform.

// Security patch adding session authentication check
// Source: https://github.com/FriendsOfShopware/FroshPlatformAdminer/commit/c4dd6c3462af178b3a7d146d3c651c2c253e902b

        header_remove('Set-Cookie');
        $_SESSION["token"] = rand(1, 1e6);
+        $_SESSION['frosh_adminer_authenticated'] = true;

        $_SESSION["dbs"]['server'][$credentials['host']][$credentials['user']] = [
            $credentials['path']

The patch introduces a session-based authentication flag (frosh_adminer_authenticated) that must be validated before the Adminer UI is loaded, ensuring only authenticated Shopware administrators can access the database management interface.

Detection Methods for CVE-2026-25878

Indicators of Compromise

• Unexpected HTTP requests to /admin/adminer from external or unauthorized IP addresses
• Access logs showing successful responses (HTTP 200) to the Adminer endpoint without corresponding Shopware admin login events
• Database audit logs revealing queries or modifications from unauthenticated sessions
• Unusual database activity patterns following access to the Adminer route

Detection Strategies

• Monitor web server access logs for requests to /admin/adminer and correlate with authenticated admin sessions
• Implement Web Application Firewall (WAF) rules to alert on unauthenticated access attempts to admin paths
• Deploy intrusion detection systems to identify reconnaissance or exploitation attempts targeting the vulnerable endpoint
• Enable database query logging to detect unauthorized SQL operations

Monitoring Recommendations

• Configure alerting for any access to /admin/adminer without a valid Shopware session token
• Implement rate limiting and geo-blocking on administrative endpoints
• Review access logs regularly for anomalous patterns targeting plugin routes
• Enable SentinelOne Singularity XDR to monitor web application behaviors and detect unauthorized administrative access attempts

How to Mitigate CVE-2026-25878

Immediate Actions Required

• Upgrade FroshPlatformAdminer to version 2.2.1 or later immediately
• Review access logs for any unauthorized access to the /admin/adminer endpoint prior to patching
• If exploitation is suspected, conduct a full database audit to identify any unauthorized changes or data exfiltration
• Consider temporarily disabling the FroshAdminer plugin until the patch can be applied

Patch Information

The vulnerability has been addressed in FroshPlatformAdminer version 2.2.1. The fix implements proper session authentication validation before loading the Adminer UI, ensuring only authenticated Shopware administrators can access the database management interface.

For detailed patch information, refer to the GitHub Security Advisory GHSA-f339-246p-wwjp and the GitHub Release v2.2.1.

Workarounds

• Restrict network access to the /admin/adminer route using firewall rules or web server configurations
• Implement additional authentication layers (e.g., HTTP Basic Auth, IP whitelisting) at the web server level
• Disable the FroshAdminer plugin if database management via Adminer is not required
• Deploy a reverse proxy with authentication enforcement for administrative routes

# Example: Restrict access to /admin/adminer in Apache (.htaccess)
<Location /admin/adminer>
    Require ip 10.0.0.0/8
    Require ip 192.168.0.0/16
</Location>

# Example: Restrict access in Nginx
location /admin/adminer {
    allow 10.0.0.0/8;
    allow 192.168.0.0/16;
    deny all;
}