CVE-2026-3535: CWE-434 Unrestricted Upload of File with Dangerous Type in mlfactory DSGVO Google Web Fonts GDPR
The DSGVO Google Web Fonts GDPR plugin for WordPress is vulnerable to arbitrary file upload due to missing file type validation in the `DSGVOGWPdownloadGoogleFonts()` function in all versions up to, and including, 1.1. The function is exposed via a `wp_ajax_nopriv_` hook, requiring no authentication. It fetches a user-supplied URL as a CSS file, extracts URLs from its content, and downloads those files to a publicly accessible directory without validating the file type. This makes it possible for unauthenticated attackers to upload arbitrary files including PHP webshells, leading to remote code execution. The exploit requires the site to use one of a handful of specific themes (twentyfifteen, twentyseventeen, twentysixteen, storefront, salient, or shapely).
AI Analysis
Technical Summary
CVE-2026-3535 is a critical vulnerability in the mlfactory DSGVO Google Web Fonts GDPR plugin for WordPress. The vulnerability arises from the DSGVOGWPdownloadGoogleFonts() function, which downloads files from user-supplied URLs without validating file types. This function is accessible via an unauthenticated AJAX hook (wp_ajax_nopriv_), enabling attackers to upload arbitrary files, including malicious PHP scripts, to a publicly accessible directory. Exploitation requires the WordPress site to use one of several specific themes (twentyfifteen, twentyseventeen, twentysixteen, storefront, salient, or shapely). The vulnerability has a CVSS 3.1 base score of 9.8, reflecting its critical severity and the potential for remote code execution.
Potential Impact
An unauthenticated attacker can upload arbitrary files, including executable PHP webshells, leading to remote code execution on the affected WordPress site. This compromises confidentiality, integrity, and availability of the system. The vulnerability is critical due to its ease of exploitation (no authentication required) and the high impact of successful attacks.
Mitigation Recommendations
No official patch or remediation is currently available for this vulnerability. Users should monitor the vendor's advisory for updates. As a temporary mitigation, restrict access to the vulnerable AJAX endpoint if possible, or avoid using the affected plugin versions and specific WordPress themes until a fix is released. Consider disabling or removing the plugin if it is not essential.
CVE-2026-3535: CWE-434 Unrestricted Upload of File with Dangerous Type in mlfactory DSGVO Google Web Fonts GDPR
Description
The DSGVO Google Web Fonts GDPR plugin for WordPress is vulnerable to arbitrary file upload due to missing file type validation in the `DSGVOGWPdownloadGoogleFonts()` function in all versions up to, and including, 1.1. The function is exposed via a `wp_ajax_nopriv_` hook, requiring no authentication. It fetches a user-supplied URL as a CSS file, extracts URLs from its content, and downloads those files to a publicly accessible directory without validating the file type. This makes it possible for unauthenticated attackers to upload arbitrary files including PHP webshells, leading to remote code execution. The exploit requires the site to use one of a handful of specific themes (twentyfifteen, twentyseventeen, twentysixteen, storefront, salient, or shapely).
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-3535 is a critical vulnerability in the mlfactory DSGVO Google Web Fonts GDPR plugin for WordPress. The vulnerability arises from the DSGVOGWPdownloadGoogleFonts() function, which downloads files from user-supplied URLs without validating file types. This function is accessible via an unauthenticated AJAX hook (wp_ajax_nopriv_), enabling attackers to upload arbitrary files, including malicious PHP scripts, to a publicly accessible directory. Exploitation requires the WordPress site to use one of several specific themes (twentyfifteen, twentyseventeen, twentysixteen, storefront, salient, or shapely). The vulnerability has a CVSS 3.1 base score of 9.8, reflecting its critical severity and the potential for remote code execution.
Potential Impact
An unauthenticated attacker can upload arbitrary files, including executable PHP webshells, leading to remote code execution on the affected WordPress site. This compromises confidentiality, integrity, and availability of the system. The vulnerability is critical due to its ease of exploitation (no authentication required) and the high impact of successful attacks.
Mitigation Recommendations
No official patch or remediation is currently available for this vulnerability. Users should monitor the vendor's advisory for updates. As a temporary mitigation, restrict access to the vulnerable AJAX endpoint if possible, or avoid using the affected plugin versions and specific WordPress themes until a fix is released. Consider disabling or removing the plugin if it is not essential.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-03-04T18:14:55.423Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d5fe4c1cc7ad14da37384d
Added to database: 4/8/2026, 7:05:48 AM
Last enriched: 4/8/2026, 7:20:55 AM
Last updated: 4/8/2026, 12:54:43 PM
Views: 89
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