The Chatterbug Forms – Fast, Flexible WordPress Form Builder plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up…
CVE-2026-125055
The Chatterbug Forms – Fast, Flexible WordPress Form Builder plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.0.2 via the cbformscheckformsubmissions function. This is due to missing server-side file extension validation in cbformscheckformsubmissions(), where the allowed-type check defaults to the uploaded file's own extension when no field restriction is configured, trivially allowing any extension including .php. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. The submission nonce printed inline on every public page containing a Chatterbug form is freely obtainable by unauthenticated visitors and therefore does not constitute an effective access control barrier.
Assessment
- CVSS
- 9.8 (v3.1)
- Severity
- Critical
- EPSS
- 1.14% chance of exploitation in the next 30 days
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 13 November 2026
- Last updated
- 13 November 2026
- Assigner
- Wordfence
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
At the source
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/7819c1fa-884b-4f1d-ba63-84057bf6da84?source=cve
- https://plugins.trac.wordpress.org/browser/chatterbug-forms/tags/1.0.2/chatterbug-forms.php#L422
- https://plugins.trac.wordpress.org/browser/chatterbug-forms/tags/1.0.2/chatterbug-forms.php#L331
- https://plugins.trac.wordpress.org/browser/chatterbug-forms/tags/1.0.2/chatterbug-forms.php#L510
- https://plugins.trac.wordpress.org/browser/chatterbug-forms/tags/1.0.2/chatterbug-forms.php#L308
- https://plugins.trac.wordpress.org/changeset/3794492/chatterbug-forms/trunk/chatterbug-forms.php
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