GutenBee <= 2.20.1 - Authenticated (Author+) Arbitrary File Upload via wp_check_filetype_and_ext Filter
Affected versions: *-2.20.1
Vulnerability type: CWE-434 Unrestricted Upload of File with Dangerous Type
Affected software, patched versions and attribution
The GutenBee – Gutenberg Blocks plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.20.1 via the gutenbee_file_and_ext_json function. This is due to a flawed strpos() substring check that only verifies whether the filename contains the string '.json' rather than confirming the filename ends with a .json extension, allowing double-extension filenames like shell.json.php to bypass validation. This makes it possible for authenticated attackers, with author-level access and above, to upload files that may be executable, which makes remote code execution possible.
GutenBee – Gutenberg Blocks
Affected versions: *-2.20.1
Patched versions: 2.20.2
Researcher credit: Athiwat Tiprasaharn (Jitlada)
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- Published
- May 27, 2026
- CVSS
- 8.8