# CVE-2026-3535: DSGVO Google Web Fonts GDPR <= 1.1 - Unauthenticated Arbitrary File Upload via 'fonturl' Parameter

> Unauthenticated attackers can upload arbitrary files, including PHP webshells, leading to remote code execution on sites using specific themes.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Apr 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-x9xw-x29g-m332

## What is CVE-2026-3535?

CVE-2026-3535 is a critical vulnerability in mlfactory DSGVO Google Web Fonts GDPR, published on 8 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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).

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2026-3535?


## How do I fix CVE-2026-3535?

No fix has been published for CVE-2026-3535 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3535 being exploited?

There is no known exploitation of CVE-2026-3535 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3535 and fix it if it is affected.

What it is: CVE-2026-3535 is a critical vulnerability in mlfactory DSGVO Google Web Fonts GDPR, published on 8 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-3535 in the wild and no public exploit code.

Affected product: mlfactory DSGVO Google Web Fonts GDPR. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-3535/ (Markdown: https://insights.sbomify.com/CVE-2026-3535/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3535
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3535
- OSV: https://osv.dev/vulnerability/CVE-2026-3535

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3535/
Summaries are generated and may contain mistakes; the official description above is the record.