CVE-2026-18933: wp-downloadmanager - Unrestricted File Upload via Missing Extension/MIME Validation and Path Traversal
The wp-downloadmanager WordPress plugin, in version 1.68.11 (also affecting the 6.9.4 release line), allows an admin-privileged user (currentusercan('managedownloads')) to upload arbitrary files via download-add.php with no extension or MIME-type validation of any kind - no wpcheckfiletypeandext, no validatefile, and no extension blocklist exist anywhere in the upload handler.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
wp-downloadmanager WordPress pluginto a version that resolves this vulnerability.Fixed in 1.68.11 - Configuration
Update the download-add.php upload handler to require extension and MIME-type checks before accepting uploads (e.g., add wp_check_filetype_and_ext / validate_file logic and an extension blocklist), since the current handler has no wp_check_filetype_and_ext, no validate_file, and no extension blocklist anywhere.
wp-downloadmanager (download-add.php upload handler) Enable extension and MIME-type validation = Reject uploads that lack a valid file extension and MIME-type (no extension/MIME should be blocked)
Event History
Frequently Asked Questions
What is the severity of CVE-2026-18933?
CVE-2026-18933 has a high severity rating of 7.2.
How do I fix CVE-2026-18933?
To fix CVE-2026-18933, update the wp-downloadmanager plugin to the latest version that addresses this vulnerability.
Who is affected by CVE-2026-18933?
CVE-2026-18933 affects WordPress sites using the wp-downloadmanager plugin version 1.68.11 and the 6.9.4 release line.
What type of vulnerability is CVE-2026-18933?
CVE-2026-18933 is classified as a Malicious File Upload vulnerability.
What can be exploited in CVE-2026-18933?
CVE-2026-18933 allows users with admin privileges to upload files without restriction on extension or MIME-type.