CVE-2026-9227: 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…

PriorityP264high8.8CVSS 3.1

AVNACLPRLUINSUCHIHAH

EPSS

0.66%

46.9th percentile

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.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
cssigniterteam	gutenbee_gutenberg_blocks	<= 2.20.1	—

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