Timing Attack User Enumeration in Shopware

Compliance Impact

CVE-2026-48011 allows an attacker to enumerate administrator usernames via a timing attack in Shopware's admin panel. This information disclosure could increase the risk of targeted attacks such as credential stuffing or spear phishing.

While the vulnerability itself does not directly disclose sensitive personal data, the ability to identify administrator usernames could indirectly impact compliance with standards like GDPR or HIPAA by facilitating unauthorized access attempts or privilege escalation.

Organizations using affected versions of Shopware should consider this vulnerability as a potential risk to the confidentiality and integrity of administrative accounts, which are critical for maintaining compliance with data protection regulations.

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Executive Summary

This vulnerability affects the Shopware open commerce platform versions prior to 6.6.10.18 and 6.7.10.1. An attacker can perform a timing attack to enumerate the usernames of administrator users. This means the attacker can discover valid administrator usernames by measuring the time it takes for the system to respond to certain requests.

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Impact Analysis

The vulnerability allows an attacker to identify administrator usernames through timing attacks. Knowing valid administrator usernames can be a first step for further attacks, such as brute force password attempts or social engineering, potentially leading to unauthorized access to the system.

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade Shopware to version 6.6.10.18 or 6.7.10.1 or later, as these versions contain the fix for the administrator username enumeration timing attack.

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Detection Guidance

CVE-2026-48011 is a timing attack vulnerability in Shopware's admin panel that allows attackers to enumerate administrator usernames by measuring response times to authentication requests.

Detection involves monitoring or testing the timing differences in responses from the `/api/oauth/token` endpoint during login attempts with different usernames.

A practical approach to detect this vulnerability is to perform scripted authentication requests with various usernames and measure the response times to identify discrepancies indicating valid usernames.

While no specific commands are provided in the resources, a common method is to use tools like curl or custom scripts to send POST requests to `/api/oauth/token` with different usernames and analyze the response time differences.

• Example curl command to test a username (replace <username> and <password>):
• curl -X POST https://your-shopware-domain/api/oauth/token -d '{"username":"<username>","password":"<password>"}' -H 'Content-Type: application/json' -w '%{time_total}\n' -o /dev/null -s

By running this command repeatedly with different usernames and comparing the total time taken (`time_total`), an attacker or tester can infer which usernames exist based on longer response times due to the password verification step.

To detect this vulnerability on your system, you can automate such timing tests and analyze the results for statistically significant timing differences.

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