CVE-2026-9227 json
GutenBee <= 2.20.1 - Authenticated (Author+) Arbitrary File Upload via wp_check_filetype_and_ext Filter
published 2026-05-28 5 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-32732
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 52%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 5 mo ago
Exploit prediction
0.68% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
- cssigniterteam GutenBee – Gutenberg Blocks
Classification
- Weakness
-
- CWE-434 Unrestricted Upload of File with Dangerous Type
- Technology feeds
References
- github.com /cssigniter/gutenbee/commit/bde934cdecf67a4de1d6548cc1fc6c59bc6690e5
- wordfence.com /threat-intel/vulnerabilities/id/2d20e8c9-975d-4e8c-8bea-50935853c7d4?source=cve
- plugins.trac.wordpress.org /browser/gutenbee/tags/2.20.1/gutenbee.php#L571
- plugins.trac.wordpress.org /browser/gutenbee/tags/2.20.1/gutenbee.php#L570
- plugins.trac.wordpress.org /browser/gutenbee/tags/2.20.1/gutenbee.php#L579
- plugins.trac.wordpress.org /browser/gutenbee/tags/2.20.0/gutenbee.php#L571
- plugins.trac.wordpress.org /browser/gutenbee/tags/2.20.0/gutenbee.php#L570
- plugins.trac.wordpress.org /browser/gutenbee/tags/2.20.0/gutenbee.php#L579
- plugins.trac.wordpress.org /changeset?sfp_email=&sfph_mail=&reponame=&old=3543574%40gutenbee&new=3543574%40gutenbee&sfp_email=&sfph_mail=
Sources
- CVE List CVE-2026-9227
- NVD CVE-2026-9227
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.