CVE-2026-9227

Description

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.

References

• https://github.com/cssigniter/gutenbee/commit/bde934cdecf67a4de1d6548cc1fc6c59bc6690e5
• https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L570
• https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L571
• https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L579
• https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php#L570