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Vulnerability record · CVE-2026-3535 · published 8 April 2026

CVE-2026-3535: Unrestricted file upload vulnerability

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).

9.8 CVSS 3.1 Critical EPSS 1.3% · top 29.8% CWE-434 · Unrestricted file upload Deferred
9.8CVSS 3.1 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
24 Jul 2026Last modified by NVD

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).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://plugins.trac.wordpress.org/browser/dsgvo-google-web-fonts-gdpr/tags/1.1/dsgvo-google-web-fonts-gdpr.php#L159
https://plugins.trac.wordpress.org/browser/dsgvo-google-web-fonts-gdpr/tags/1.1/dsgvo-google-web-fonts-gdpr.php#L46
https://plugins.trac.wordpress.org/browser/dsgvo-google-web-fonts-gdpr/trunk/dsgvo-google-web-fonts-gdpr.php#L159
https://plugins.trac.wordpress.org/browser/dsgvo-google-web-fonts-gdpr/trunk/dsgvo-google-web-fonts-gdpr.php#L46
https://www.wordfence.com/threat-intel/vulnerabilities/id/6203ffaf-5efd-4c66-85f0-cc3a05a03084?source=cve

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Source: NIST National Vulnerability Database (record CVE-2026-3535), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.