Security readout for executives and security teams
Plain-English summary
This WordPress plugin flaw can let unauthenticated visitors upload files that should not be allowed. If a site has a Contact Form 7 form using the plugin’s multiple-file upload field with accepted type set to “*”, server compromise may be possible. Public data does not show known active exploitation.
Executive priority
Prioritize sites that are public-facing and accept uploads through Contact Form 7. Treat as high urgency because unauthenticated upload flaws can lead to full site compromise, but validate exposure first because exploitation depends on form configuration.
Technical view
CVE-2026-3459 is a CWE-434 arbitrary file upload issue in Drag and Drop Multiple File Upload for Contact Form 7. The reported weakness is insufficient file type validation in dnd_upload_cf7_upload. CVSS is 8.1. Source data conflicts on affected versions: the title says <=1.3.9.5, while the description says <=1.3.7.3.
Likely exposure
Internet-facing WordPress sites using this plugin are the concern, especially forms with a multiple-file upload field configured to accept “*”. Sites without that plugin or without that form configuration appear less exposed based on the provided description.
Exploitation context
The CVE is not in CISA KEV in the provided data, and no cited source states active exploitation. The reported attack is unauthenticated and network-accessible, but CVSS marks attack complexity high. Remote code execution is described as possible, not guaranteed.
Researcher notes
Use caution with version scoping. The supplied CVE text and title disagree on affected versions. The WordPress Trac references point to plugin code and changeset 3475121, but the provided bundle does not clearly name a fixed version. Avoid assuming active exploitation or universal RCE.
Mitigation direction
- Inventory WordPress sites for this plugin and exposed upload forms.
- Check vendor and WordPress plugin guidance for the corrected version.
- Update to a release containing the referenced security changes, if available.
- Remove “*” from accepted file types on affected upload fields.
- Disable affected upload forms or the plugin until remediation is confirmed.
Validation and detection
- Confirm installed plugin version across all WordPress sites.
- Review Contact Form 7 forms for multiple upload fields accepting “*”.
- Verify file type validation behavior after updating or reconfiguring.
- Review upload directories for unexpected or executable files.
- Check web logs for unusual unauthenticated upload activity.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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-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.
Open ATT&CK lookupExecution behavior lookup
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.
Open ATT&CK lookupFile access behavior lookup
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.
Open ATT&CK lookupCVE-2026-3459 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
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.
CVSS vector scores
1 official scoreWe 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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H2.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/3205670c-5c3c-48c3-a34a-6f9c25668258?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.5/inc/dnd-upload-cf7.php#L886CVE reference
- https://plugins.trac.wordpress.org/changeset/3475121/drag-and-drop-multiple-file-upload-contact-form-7CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
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.