CVE-2026-14894: Super Forms <= 6.3.313 - Unauthenticated Arbitrary File Upload via 'data' Parameter (datauristring / value)
The Super Forms – Drag & Drop Form Builder plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 6.3.313 via the submit_form function. This is due to missing file type validation and the absence of any capability check on the submit_form nopriv AJAX handler, whose only barrier is a session nonce freely obtainable by unauthenticated visitors via a separate nopriv endpoint. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. The nonce requirement is trivially bypassed because the super_create_nonce nopriv AJAX action allows any unauthenticated visitor to mint a valid sf_nonce and session cookie in a single prior request, reducing exploitation to two unauthenticated HTTP requests.
Security readout for executives and security teams
Plain-English summary
A WordPress plugin used to build forms can allow an anonymous internet visitor to upload dangerous files. If those files execute on the server, the attacker could take over the website. The source bundle does not show confirmed active exploitation, but the impact and ease of attack make this urgent.
Executive priority
Treat as same-day priority for any public WordPress property using this plugin. The business risk is full website compromise, including data theft, defacement, malware hosting, and operational outage.
Technical view
Super Forms Drag & Drop Form Builder up to and including 6.3.313 lacks file type validation in submit_form and exposes a nopriv AJAX path. The nonce barrier is described as freely obtainable through another unauthenticated endpoint, making remote code execution possible through arbitrary file upload.
Likely exposure
Internet-facing WordPress sites running Super Forms Drag & Drop Form Builder versions up to and including 6.3.313 are the likely exposed systems. Sites accepting public form submissions are especially relevant.
Exploitation context
CISA KEV status is false in the bundle, and no cited source confirms active exploitation. However, the vulnerability is unauthenticated, low complexity, requires no user interaction, and is rated CVSS 9.8.
Researcher notes
Evidence supports CWE-434 arbitrary file upload with unauthenticated reachability and weak nonce protection. The bundle references a GitHub commit but does not name a fixed plugin version, so remediation status should be verified with vendor or Wordfence updates.
Mitigation direction
Identify all WordPress sites using Super Forms.
Check vendor and Wordfence guidance for a confirmed fixed release.
Disable or remove the plugin until a confirmed fix is applied.
Apply the referenced vendor fix only through trusted release channels.
Harden upload execution controls on WordPress hosting where feasible.
Validation and detection
Confirm installed Super Forms versions across production and staging.
Review web logs for anomalous unauthenticated form submission activity.
Inspect upload directories for unexpected executable files.
Check WordPress admin users and plugin files for unauthorized changes.
Verify remediation against vendor guidance after updating or disabling.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Potential ATT&CK relevance
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
cwe · medium confidence lookup
CWE-434: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
1CVSS vectors
5Timeline events
1ADP providers
3Source links
SSVC decision data
CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: total
CVSS vector scores
1 official score
We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
CWE-434 · source CWE mapping
Unrestricted Upload of File with Dangerous Type
Unrestricted Upload of File with Dangerous Type represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.