CVE-2023-6635: EditorsKit <= 1.40.3 - Authenticated (Administrator+) Arbitrary File Upload

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-02-05 · updated 2026-06-17
Weakness: CWE-434

Description

The EditorsKit plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation on the 'import_styles' function in versions up to, and including, 1.40.3. This makes it possible for authenticated attackers with administrator-level capabilities or above, to upload arbitrary files on the affected site's server which may make remote code execution possible.

Affected products

munirkamal Gutenberg Block Editor Toolkit – EditorsKit: through 1.40.3

References

https://plugins.trac.wordpress.org/browser/block-options/tags/1.40.3/includes/addons/styles-manager/rest-api/gutenberghub-styles-import-export-controller.php#L100
https://plugins.trac.wordpress.org/changeset/3010794/block-options
https://www.wordfence.com/threat-intel/vulnerabilities/id/4528f9a1-7027-4aa9-b006-bea84aa19c84?source=cve
https://plugins.trac.wordpress.org/browser/block-options/tags/1.40.3/includes/addons/styles-manager/rest-api/gutenberghub-styles-import-export-controller.php#L100
https://plugins.trac.wordpress.org/changeset/3010794/block-options
https://www.wordfence.com/threat-intel/vulnerabilities/id/4528f9a1-7027-4aa9-b006-bea84aa19c84?source=cve

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