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Executive Summary

The WordPress Sonaar Theme, versions 4.27.4 and below, contains a high-priority Privilege Escalation vulnerability (CVE-2025-59563). This flaw allows attackers who have low-privilege accounts, such as Subscribers, to escalate their privileges to higher levels, potentially gaining full control over the website.

This vulnerability is classified under OWASP Top 10 A7 (Identification and Authentication Failures) and is actively exploited in mass campaigns targeting thousands of websites.

The issue was reported by Tran Nguyen Bao Khanh and fixed in version 4.27.5 of the Sonaar Theme.

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Detection Guidance

This vulnerability affects WordPress sites using the Sonaar Theme version 4.27.4 or below, where low-privilege Subscriber accounts can escalate privileges.

Detection involves checking the installed Sonaar Theme version on your WordPress site to see if it is 4.27.4 or lower.

You can detect the vulnerable version by running commands to check the theme version, for example:

• Using WP-CLI: wp theme list --status=active
• Check the style.css file in the Sonaar theme directory for the version number.

Additionally, monitoring logs for unusual privilege escalation attempts from Subscriber accounts may help detect exploitation attempts.

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Impact Analysis

If exploited, this vulnerability can allow an attacker with a Subscriber-level account to escalate their privileges and gain full control of the affected website.

• Complete takeover of the website by the attacker.
• Potential unauthorized access to sensitive data.
• Ability to modify or delete website content and settings.
• Increased risk of further attacks or malware installation.

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Compliance Impact

The vulnerability allows attackers with low-privilege accounts to escalate their privileges to full control of the website, which can lead to unauthorized access and potential data breaches.

Such unauthorized access and control can compromise the confidentiality, integrity, and availability of sensitive data, potentially violating compliance requirements under standards like GDPR and HIPAA that mandate strict access controls and protection of personal and health information.

Therefore, if exploited, this vulnerability could negatively impact an organization's compliance posture by exposing sensitive data or systems to unauthorized users.

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Mitigation Strategies

The primary mitigation step is to update the Sonaar Theme to version 4.27.5 or later, which contains the patch for this vulnerability.

If updating immediately is not possible, users should seek assistance from their hosting provider or web developer to apply temporary mitigations.

Patchstack has issued a mitigation rule to block attacks targeting this vulnerability until the update can be applied.

It is also advisable to review and restrict Subscriber-level privileges where possible to reduce the risk of exploitation.

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