Attack Chain

1. An attacker obtains author-level or higher access to a WordPress site using the vulnerable Betheme theme.
2. The attacker navigates to the icon pack upload section within the Betheme theme settings.
3. The attacker crafts a ZIP archive containing a malicious PHP file disguised as an icon or other legitimate file type.
4. The attacker uploads the malicious ZIP archive using the icon pack upload functionality.
5. The upload_icons() function moves and unzips the archive into a publicly accessible uploads directory without proper file type validation.
6. The malicious PHP file is extracted and stored within the uploads directory.
7. The attacker accesses the uploaded PHP file via a direct HTTP request to the file’s location.
8. The server executes the malicious PHP code, granting the attacker remote code execution capabilities.

Impact

Successful exploitation of this vulnerability allows an attacker to execute arbitrary code on the WordPress server. This can lead to complete compromise of the website, including data theft, defacement, or further exploitation of the underlying server infrastructure. Given the Betheme theme’s popularity, a large number of websites are potentially vulnerable. The impact ranges from data breaches and financial loss to reputational damage for affected organizations.

Recommendation

• Upgrade the Betheme theme to a version greater than 28.4 to patch CVE-2026-6261.
• Deploy the Sigma rules provided below to your SIEM to detect potential exploitation attempts.
• Monitor web server logs (category webserver, product linux) for suspicious requests to the /wp-content/uploads/ directory, especially for PHP files.