EUVD-2026-41368
GHSA-7ch9-34jx-wqhr
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network upload (PR:N) with a trivially scriptable nonce fetch keeps AC:L; resulting RCE yields full C/I/A impact within the WordPress host (S:U).
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
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.
Articles & Coverage 2
AnalysisAI
Arbitrary file upload leading to remote code execution in the Divi Form Builder WordPress plugin (versions through 5.1.8) lets unauthenticated attackers upload executable PHP files and run arbitrary code on the server. Attacker-controlled input from the acceptFileTypes POST parameter is interpolated directly into the file-validation regex in do_image_upload(), allowing alternate PHP extensions (.phtml, .phar, .php5, .php7) that evade the plugin's .php-only .htaccess block - and on Nginx the .htaccess protection does not apply at all. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target run the Divi Form Builder plugin at version 5.1.8 or earlier with at least one publicly reachable page containing a Divi form, since the attacker must first harvest a valid nonce from that page. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (9.8) is internally consistent with the description: network-reachable, low-complexity, no privileges or user interaction, full compromise of confidentiality, integrity, and availability via code execution. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker scrapes a nonce from any public page hosting a Divi form, then submits a crafted multipart upload setting acceptFileTypes so the validation regex permits a .phtml (or .phar/.php5/.php7) payload. The malicious file is written to the public /wp-content/uploads/de_fb_uploads/ directory, and the attacker fetches it over HTTP to execute a web shell - trivially reliable on Nginx where the .htaccess safeguard has no effect. … |
| Remediation | Because the description marks version 5.1.3 as only a partial fix and lists all versions up to and including 5.1.8 as vulnerable, no fully patched release is independently confirmed from the available data; consult the vendor changelog at https://diviengine.com/divi-form-builder-changelog/ and upgrade to the newest release published after 5.1.8 that explicitly notes the file-upload fix, and confirm the fixed version with the vendor before relying on it. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Audit all WordPress installations for Divi Form Builder presence and version; disable the plugin and remove file upload functionality immediately. …
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