EUVD-2026-56928
GHSA-vgm7-9pjc-5gcf
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network request against a public form with no interaction (PR:N/UI:N/AC:L); arbitrary deletion of wp-config.php enables full takeover, justifying C:H/I:H/A:H.
Primary rating from Vendor (wordfence).
CVSS VectorVendor: wordfence
Lifecycle Timeline
2DescriptionCVE.org
The Formidable Digital Signatures plugin for WordPress is vulnerable to file deletion due to insufficient file path validation in the delete_file function in all versions up to, and including, 3.0.6. This makes it possible for unauthenticated attackers to delete files on the server by supplying an attacker-controlled filename in the item_meta[field_id][content] parameter alongside the delete_saved_image flag during the standard entry-creation POST flow on any form that accepts anonymous submissions.
Articles & Coverage 2
AnalysisAI
Arbitrary file deletion in the Formidable Digital Signatures plugin for WordPress (all versions through 3.0.6) lets unauthenticated attackers delete server files by passing an attacker-controlled path in item_meta[field_id][content] together with the delete_saved_image flag during normal anonymous form submission. Because deleting wp-config.php can force WordPress back into its setup routine, this file-deletion primitive escalates to full site takeover, which is why it carries a CVSS 9.8. No public exploit identified at time of analysis; not listed in CISA KEV.
Technical ContextAI
The plugin extends Formidable Forms with signature-capture fields and stores uploaded/saved signature images on disk. The vulnerable delete_file function accepts a filename from the entry-creation POST body and removes it without adequately normalizing or constraining the path - the classic CWE-23 (Relative Path Traversal) root cause, where '../' sequences let the supplied path escape the intended signature/upload directory to any file the web server user can write to. Because the code path is reachable via the standard entry-creation flow, no plugin-specific admin feature needs to be enabled beyond having a public form; the delete_saved_image flag simply routes the request into the unguarded deletion logic. On WordPress, deletion of wp-config.php is the well-known escalation: with the config gone, an attacker can re-trigger the installer and point the site at a database they control, yielding administrator access and effectively code execution.
RemediationAI
Vendor-released patch: upgrade the Formidable Digital Signatures plugin to version 3.1 or later, per the vendor changelog at https://formidableforms.com/changelog/digital-signature-forms-3-1/ (advisory: https://www.wordfence.com/threat-intel/vulnerabilities/id/c9a5f8ca-7efc-401b-8a93-07fbe7204dce). If immediate patching is not possible, temporarily deactivate the plugin, or at minimum disable anonymous/public submission on any form that uses signature fields so the entry-creation path is no longer reachable unauthenticated - the trade-off is loss of public signature intake until patched. As additional hardening, ensure wp-config.php and core files are not writable by the web server user (deny web-server write on the config file), which blocks the takeover escalation even if a deletion is attempted; the side effect is that plugins/updates needing filesystem writes may require manual intervention. A WAF rule blocking requests containing '../' in item_meta[...][content] alongside delete_saved_image can serve as an interim virtual patch, with the caveat that path-encoding bypasses may evade naive signatures.
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Same weakness CWE-23 – Relative Path Traversal
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External POC / Exploit Code
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