SigmaForms Pro <= 1.4.11 - Unauthenticated Arbitrary File Deletion via Path Traversal in File Upload Field
Strategic Overview
- Status
- Patched in 1.4.12
- Affected Plugin
- SigmaForms Pro – AI Generated Forms
- Affected Version
<= 1.4.11- CVSS
- 9.8Critical
- Weakness type
- CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- CVE
CVE-2026-78657
At a glance
CVE-2026-78657 is a critical-severity Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in the SigmaForms Pro WordPress plugin, affecting versions <= 1.4.11. It carries a CVSS score of 9.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 1.4.12; sites on affected versions should update now. Disclosed September 2026, reported by Doan Dinh Van.
Vulnerability Overview
The SigmaForms Pro – AI Generated Forms plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the delete_submission_files function in all versions up to, and including, 1.4.11. This makes it possible for unauthenticated attackers to delete arbitrary files on the server, which can easily lead to remote code execution when the right file is deleted (such as wp-config.php). The malicious path traversal URL is submitted via form upload field and stored in the database, with deletion triggered when an administrator deletes the submission record from the admin panel.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.
CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Reaching this weakness in SigmaForms Pro <= 1.4.11 takes no account at all. Path traversal happens when user-controlled text is used to build a filesystem path without being constrained to an intended directory, so sequences like ../ walk the resolved path somewhere else.
Depending on the operation, it means reading files outside the intended folder — wp-config.php being the usual target — or writing to and deleting paths the web server can touch. For SigmaForms Pro the fix is 1.4.12: builds <= 1.4.11 are affected, anything from 1.4.12 onward is not.
Remediation
Update to version 1.4.12, or a newer patched version
How does WordSec protect against this?
Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: SigmaForms Pro 1.4.12 closes this, and updating the plugin is the step that ends it.
- Firewall
- Login Security
- Alerts
External References
Related records
Other vulnerabilities in SigmaForms Pro – AI Generated Forms
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