Missing Authorization in Open Shop Theme

Executive Summary

The WordPress Open Shop Theme, versions 1.7.1 and earlier, contains a Broken Access Control vulnerability (CVE-2026-57405). This vulnerability arises from missing authorization, authentication, or nonce token checks, which allows unprivileged users to perform actions that should require higher privileges.

Essentially, the theme incorrectly configures access control security levels, enabling attackers to exploit these weaknesses and gain unauthorized access or perform unauthorized actions.

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Detection Guidance

Detecting the CVE-2026-57405 vulnerability in the Open Shop theme (versions <= 1.7.1) involves checking for missing authorization controls that allow unprivileged users to perform higher-privileged actions. Below are some suggested methods to detect this vulnerability:

• Verify the installed version of the Open Shop theme. If the version is 1.7.1 or earlier, the system is vulnerable. You can check the theme version via the WordPress admin dashboard under **Appearance > Themes** or by inspecting the theme's style.css file.
• Use a WordPress security plugin (e.g., Patchstack, Wordfence, or Sucuri) to scan for known vulnerabilities. These tools can identify if the installed theme version is affected by CVE-2026-57405.
• Manually test for missing authorization by attempting to access or modify privileged actions (e.g., theme settings, user roles) as a low-privileged user (e.g., subscriber or contributor). If such actions are executable without proper checks, the vulnerability is present.
• Review server logs for unusual activity, such as unauthorized requests to theme-related endpoints or unexpected changes to theme configurations. Look for patterns like repeated failed access attempts or successful actions by low-privileged users.
• If Patchstack's mitigation rule is available, apply it to your web application firewall (WAF) or security plugin to detect and block exploitation attempts. This can help identify active attacks targeting the vulnerability.

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Impact Analysis

This vulnerability can allow attackers with low privileges to escalate their access and perform higher-privileged actions on websites using the affected Open Shop theme versions. This can lead to unauthorized modifications, potential disruption of services, or other harmful impacts.

Because the vulnerability is moderately dangerous and can be exploited in mass campaigns targeting thousands of websites, it poses a significant risk to affected sites.

Immediate action is recommended, such as updating the theme to version 1.7.2 or later, or applying mitigation rules provided by Patchstack to block attacks until the update is applied.

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Compliance Impact

The CVE-2026-57405 vulnerability, which involves missing authorization and broken access control, can have significant implications for compliance with standards and regulations like GDPR and HIPAA. These frameworks emphasize the protection of sensitive data and require strict access controls to prevent unauthorized actions.

• Under GDPR, organizations must ensure appropriate security measures are in place to protect personal data. A broken access control vulnerability could lead to unauthorized access or modification of personal data, potentially resulting in data breaches. This may violate GDPR's requirements for data integrity, confidentiality, and accountability, leading to fines or legal consequences.
• For HIPAA, which governs the protection of health information, unauthorized access to or alteration of protected health information (PHI) due to this vulnerability could constitute a breach. HIPAA requires covered entities to implement access controls and audit mechanisms to prevent such incidents, and failure to do so may result in penalties.

Additionally, the vulnerability's potential for exploitation in mass campaigns increases the risk of widespread non-compliance, as attackers could target multiple websites to gain unauthorized access to sensitive data. Organizations must address this vulnerability promptly to maintain compliance with these regulations.

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Mitigation Strategies

Immediate action is recommended to mitigate the vulnerability in the WordPress Open Shop Theme versions 1.7.1 and earlier.

• Update the theme to version 1.7.2 or later.
• If updating is not possible, seek assistance from your hosting provider or web developer.
• Apply the mitigation rule provided by Patchstack to block attacks until the update is applied.

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