# CVE-2026-78657: SigmaForms Pro arbitrary file deletion via path traversal

Source: https://junglewise.ai/threats/cve-2026-78657-sigmaforms-pro-arbitrary-file-deletion-via-path-traversal  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-02. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-78657 · Severity: critical · CVSS 9.8 · Published 2026-09-02

SigmaForms Pro is a WordPress plugin that generates forms using AI. The plugin fails to properly validate file paths when administrators delete form submissions, allowing unauthenticated attackers to delete arbitrary files from the server by submitting a malicious path through a form upload field. By deleting critical files like wp-config.php, an attacker can take over the entire WordPress site or achieve remote code execution.

Vendors: [BdThemes](https://junglewise.ai/threats/vendors/bdthemes).

## Quick answers

**Is CVE-2026-78657 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-78657 being exploited in the wild.

**How severe is CVE-2026-78657?** Critical severity, with a CVSS score of 9.8, published 2 September 2026.

**Which products and versions are affected?** BdThemes SigmaForms Pro up to and including 1.4.11.

**Is there a fix for CVE-2026-78657?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-78657 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-78657?** Check whether you run BdThemes SigmaForms Pro at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a path traversal flaw in the delete_submission_files function that fails to validate or sanitize file paths before deletion. An unauthenticated attacker can craft a malicious file path (e.g., using traversal sequences like "../../") and submit it through a form upload field; the malicious path is stored in the database. When an administrator later deletes the submission record from the WordPress admin panel, the delete_submission_files function processes the stored path without proper validation and deletes the arbitrary file on the server. This affects all versions up to and including 1.4.11. No patch information is currently available.

## Affected products

- BdThemes SigmaForms Pro up to and including 1.4.11

## Timeline

- 2026-09-02: disclosed

## References

- [https://feedback.bdthemes.com/announcements](https://feedback.bdthemes.com/announcements)
- [https://www.wordfence.com/threat-intel/vulnerabilities/id/c714e2b3-8a96-4078-99a4-4ce620939828?source=cve](https://www.wordfence.com/threat-intel/vulnerabilities/id/c714e2b3-8a96-4078-99a4-4ce620939828?source=cve)

## Related threats

- [BDthemes SigmaForms Pro unauthenticated arbitrary file upload](https://junglewise.ai/threats/cve-2026-52705-bdthemes-sigmaforms-pro-unauthenticated-arbitrary-file-upload)