CVE-2026-48011: Shopware Information Disclosure Flaw

CVE-2026-48011 Overview

CVE-2026-48011 is a timing-based information disclosure vulnerability in Shopware, an open-source commerce platform. The flaw allows unauthenticated attackers to enumerate administrator usernames by measuring response time variations during authentication attempts. Shopware versions prior to 6.6.10.18 and 6.7.10.1 are affected. The issue is categorized under CWE-208: Observable Timing Discrepancy. Shopware released patched versions 6.6.10.18 and 6.7.10.1 to address the issue.

Critical Impact
Remote, unauthenticated attackers can identify valid administrator usernames, enabling targeted credential-based attacks such as password spraying and brute-force login attempts against high-privilege accounts.

Affected Products

Shopware versions prior to 6.6.10.18 (6.6.x branch)
Shopware versions prior to 6.7.10.1 (6.7.x branch)
Shopware administrator authentication subsystem

Discovery Timeline

2026-06-10 - CVE-2026-48011 published to NVD
2026-06-10 - Last updated in NVD database

Technical Details for CVE-2026-48011

Vulnerability Analysis

The vulnerability resides in Shopware's administrator authentication flow. When the server processes a login attempt, the time required to respond differs based on whether the supplied username corresponds to an existing administrator account. Attackers can compare these timing differences across many requests to determine which usernames are valid.

This class of weakness, known as a side-channel timing attack, does not directly expose credentials. Instead it leaks the existence of accounts, which is sensitive information for an administrative interface. Once valid usernames are known, attackers can focus credential-stuffing or brute-force activity against confirmed accounts.

Root Cause

The root cause is non-constant-time handling of authentication logic for valid versus invalid usernames. When an existing username is submitted, the application performs additional work — such as password hash verification — while non-existent usernames return earlier. The measurable delay difference allows an attacker to distinguish the two cases without ever receiving a positive authentication response.

Attack Vector

The attack is remote and unauthenticated, requiring only network access to the Shopware administrator login endpoint. An attacker submits authentication requests with candidate usernames and records server response times. Statistical analysis across repeated samples isolates timing patterns that reveal valid administrator accounts. Attack complexity is high because timing noise from network jitter and server load must be filtered through repeated measurements.

The vulnerability is described in prose because no proof-of-concept code has been published. Refer to the GitHub Security Advisory GHSA-7w52-7jvm-m9vw for vendor-supplied technical details.

Detection Methods for CVE-2026-48011

Indicators of Compromise

High volumes of failed administrator login attempts originating from a single IP address or a small set of addresses
Sequential or dictionary-style username submissions to the /api/oauth/token or administrator login endpoint
Repeated requests with near-identical payloads but varying username fields, suggesting automated enumeration

Detection Strategies

Enable verbose authentication logging on the Shopware administrator endpoint and aggregate logs into a SIEM for analysis
Apply rate-based detection rules that flag unusual request frequencies against authentication routes
Correlate failed login bursts with subsequent successful logins from the same source to identify follow-on credential attacks

Monitoring Recommendations

Monitor web application firewall (WAF) telemetry for repeated POST requests to administrator login endpoints with rotating username values
Track response-time distributions on authentication endpoints to detect probing tools that issue large numbers of low-rate requests
Alert on access from anonymizing infrastructure such as Tor exit nodes or known scanning ranges

How to Mitigate CVE-2026-48011

Immediate Actions Required

Upgrade Shopware 6.6.x installations to version 6.6.10.18 or later
Upgrade Shopware 6.7.x installations to version 6.7.10.1 or later
Restrict access to the administrator login endpoint by IP allowlist where operationally feasible
Enforce multi-factor authentication (MFA) for all administrator accounts to reduce the value of leaked usernames

Patch Information

Shopware addressed the timing discrepancy in releases v6.6.10.18 and v6.7.10.1. Administrators running affected versions should plan an immediate upgrade. Full advisory details are available in GHSA-7w52-7jvm-m9vw.

Workarounds

Place the administrator interface behind a VPN or zero-trust network access gateway to limit exposure to untrusted networks
Deploy a WAF rule to rate-limit requests to authentication endpoints and block clients exceeding thresholds
Use non-obvious administrator usernames to increase the search space an attacker must enumerate

bash

# Configuration example: upgrade Shopware via Composer
composer require shopware/core:6.7.10.1 shopware/administration:6.7.10.1 \
  shopware/storefront:6.7.10.1 shopware/elasticsearch:6.7.10.1 --update-with-all-dependencies
bin/console system:update:finish
bin/console cache:clear