Unauthenticated code execution via attacker-controlled upload regex
Published Jul 2, 2026 · Updated Jul 2, 2026
Unrestricted file upload in Divi Engine Divi Form Builder 5.1.8 and earlier allows remote attackers to execute PHP via form uploads. The do_image_upload() function interpolates the attacker-controlled acceptFileTypes POST value into its extension-validation regular expression, letting executable suffixes pass and saving files in a web-accessible upload directory. A nonce exposed by any public page containing a form is sufficient; requesting the uploaded file over HTTP executes it, and .htaccess defenses do not apply on Nginx.
Summary
What happened
Unrestricted file upload in Divi Engine Divi Form Builder 5.1.8 and earlier allows remote attackers to execute PHP via form uploads. The do_image_upload() function interpolates the attacker-controlled acceptFileTypes POST value into its extension-validation regular expression, letting executable suffixes pass and saving files in a web-accessible upload directory. A nonce exposed by any public page containing a form is sufficient; requesting the uploaded file over HTTP executes it, and .htaccess defenses do not apply on Nginx.
The record
- CVE
- CVE-2026-5524
- Published
- Jul 2, 2026
- Updated
- Jul 2, 2026
- Vendor
- Divi Engine
- Product
- Divi Form Builder
- Classifications
- CWE-434, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 2, 2026CVE publishedPublication date reported by the CVE source.
- Jul 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=5.1.8
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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