CVE-2026-5524
CriticalExploitedDivi Form Builder <= 5.1.8 - Unauthenticated Arbitrary File Upload Leading to Remote Code Execution via 'acceptFileTypes' Parameter
Published Jul 1, 2026 · Updated Jul 2, 2026 · Also known as 9692deb2-2526-4983-8a13-93a382e230c8
Key Facts
Patch immediately- CVE-2026-5524 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Divi Form Builder (wordpress-plugin).
- It is exploited in the wild, listed in Industry KEV feed since Jul 2, 2026. No public exploit code is known.
- EPSS estimates a 3.5% probability of exploitation in the next 30 days.
- Fixed versions are available, including Divi Form Builder 5.1.9.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
3.5%
Higher than 88.9% of all scored CVEs
Exploited in the wild
Yes
1 catalog listing
Public exploit code
None known
Get the full CVE-2026-5524 brief as a PDF
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Description
The Divi Form Builder plugin for WordPress is vulnerable to Arbitrary File Upload leading to Remote Code Execution in all versions up to and including 5.1.8. This is due to insufficient file extension validation in the do_image_upload() function where user-supplied input from the acceptFileTypes POST parameter is directly interpolated into a regular expression used to validate uploaded files. Attackers can specify PHP-executable extensions such as .phtml, .phar, .php5, or .php7 to bypass the plugin's .htaccess protection which only blocks .php files specifically. Additionally, on Nginx-based servers, the .htaccess protection is completely ineffective as Nginx does not process .htaccess files. This makes it possible for unauthenticated attackers (who can obtain a nonce from any public page containing a form) to upload executable PHP files to the publicly accessible /wp-content/uploads/de_fb_uploads/ directory and achieve Remote Code Execution by accessing the uploaded file via HTTP. The vulnerability was partially patched in version 5.1.3.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Jul 2, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Divi Form Builderwordpress-plugin | See advisory | 5.1.9 |
Patched Releases
Divi Form Builder
5.1.9
Timeline
Publicly disclosed
Jul 1, 2026
Added to Industry KEV feed
Jul 2, 2026
Last updated
Jul 2, 2026
Weakness Type
- CWE-434 Unrestricted Upload of File with Dangerous Type
References
- advisoryhttps://plugins.trac.wordpress.org/browser/rometheme-for-elementor/tags/2.0.3/Inc/Modules/Templatekits/TemplatekitAPI.php#L39
- advisoryhttps://plugins.trac.wordpress.org/browser/rometheme-for-elementor/trunk/Inc/Modules/Templatekits/TemplatekitAPI.php#L39
- advisoryhttps://plugins.trac.wordpress.org/changeset/3568335/rometheme-for-elementor/trunk/Inc/Modules/Templatekits/TemplatekitAPI.php
- advisoryhttps://plugins.trac.wordpress.org/changeset?old_path=%2Frometheme-for-elementor/tags/2.0.7&new_path=%2Frometheme-for-elementor/tags/2.0.8
- advisoryUSOM advisory
FAQ
Common Questions.
The Divi Form Builder plugin for WordPress is vulnerable to Arbitrary File Upload leading to Remote Code Execution in all versions up to and including 5.1.8.
Affected: Divi Form Builder (wordpress-plugin). The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Jul 2, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Divi Form Builder 5.1.9.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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