CVE-2026-25878: FroshAdminer Authentication Bypass Flaw

CVE-2026-25878 Overview

CVE-2026-25878 is a missing authentication vulnerability [CWE-306] in FroshAdminer, the Adminer plugin for the Shopware Platform maintained by FriendsOfShopware. In versions prior to 2.2.1, the /admin/adminer route was registered with auth_required=false and performed no session validation. Unauthenticated remote attackers can reach the Adminer database management interface directly over the network. The maintainers fixed the issue in release 2.2.1 by enforcing Shopware admin authentication on the route.

Critical Impact
Unauthenticated network attackers can access the Adminer UI on vulnerable Shopware installations, enabling reconnaissance of the database management interface and potential follow-on attacks against shop data.

Affected Products

FriendsOfShopware FroshAdminer (FroshPlatformAdminer) versions prior to 2.2.1
Shopware Platform installations using the FroshAdminer plugin
Fixed version: FroshAdminer 2.2.1

Discovery Timeline

2026-02-09 - CVE-2026-25878 published to NVD
2026-02-28 - Last updated in NVD database

Technical Details for CVE-2026-25878

Vulnerability Analysis

FroshAdminer integrates the Adminer database management tool into the Shopware administration backend. The plugin exposes the tool through the /admin/adminer route. In versions before 2.2.1, this route was registered in the plugin's routing configuration with auth_required=false. The controller backing the route did not perform any session validation or admin role check before serving the Adminer interface.

As a result, the Adminer UI was reachable by any unauthenticated client able to send HTTP requests to the Shopware admin path. The vulnerability falls under Missing Authentication for Critical Function [CWE-306]. The CVSS vector indicates a network-reachable issue with no privileges or user interaction required, with confidentiality impact limited to the exposure of the Adminer interface itself.

Root Cause

The root cause is an insecure route configuration. The Shopware routing definition for the Adminer endpoint set auth_required=false, instructing the framework to skip the standard admin authentication middleware. The controller logic did not compensate by validating the admin session token, the API context, or any role claim before rendering the Adminer page. The fix commit c4dd6c3462af178b3a7d146d3c651c2c253e902b enforces admin authentication on the route.

Attack Vector

An attacker sends an unauthenticated HTTP GET request to the /admin/adminer path on a Shopware host running a vulnerable version of FroshAdminer. The application returns the Adminer interface without challenging for credentials. From there, the attacker can interact with Adminer's login form and database selection features that should have been gated behind admin authentication. Exploitation requires only network reachability to the Shopware admin endpoint.

No public proof-of-concept exploit is listed for this CVE, and the EPSS score is 0.027%. The vendor advisory and patch commit are published in the FroshPlatformAdminer GitHub Security Advisory GHSA-f339-246p-wwjp.

Detection Methods for CVE-2026-25878

Indicators of Compromise

Unauthenticated HTTP requests in web server logs targeting /admin/adminer that return HTTP 200 responses
Requests to /admin/adminer originating from IP addresses that have never authenticated to the Shopware admin
Adminer session artifacts or cookies appearing on hosts where Adminer access was not expected

Detection Strategies

Audit installed FroshAdminer versions across Shopware deployments and flag any version below 2.2.1
Inspect Shopware route configuration for entries setting auth_required=false on administrative paths
Review web access logs for historical hits to /admin/adminer and correlate with admin session cookies to identify unauthenticated access

Monitoring Recommendations

Alert on any HTTP request to /admin/adminer that lacks a valid Shopware admin session cookie
Monitor reverse proxy and WAF logs for scanning patterns probing Shopware admin paths
Track plugin inventory changes in Shopware to ensure FroshAdminer remains on a patched version

How to Mitigate CVE-2026-25878

Immediate Actions Required

Upgrade FroshAdminer to version 2.2.1 or later on all Shopware installations
Restrict network access to Shopware admin paths to trusted management networks until the patch is applied
Review web server logs for prior unauthenticated access to /admin/adminer and investigate any matches

Patch Information

The vulnerability is fixed in FroshAdminer 2.2.1. The fix is implemented in commit c4dd6c3, which enforces Shopware admin authentication on the Adminer route. Release notes are available on the FroshPlatformAdminer 2.2.1 release page.

Workarounds

Block access to /admin/adminer at the reverse proxy or WAF layer until the plugin can be upgraded
Temporarily uninstall or disable the FroshAdminer plugin in the Shopware administration if it is not actively required
Enforce IP allowlisting on the Shopware admin path to limit exposure of administrative routes

bash

# Example nginx workaround: restrict /admin/adminer to a trusted management network
location /admin/adminer {
    allow 10.0.0.0/24;
    deny all;
}