Chatterbug Forms <= 1.0.2 - Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-125055
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-13 10:17:28 UTC
Updated2026-11-13 23:17:15 UTC
DescriptionThe 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 cbforms_check_form_submissions function. This is due to missing server-side file extension validation in cbforms_check_form_submissions(), 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-434 | CWE-434 CWE-434 Unrestricted Upload of File with Dangerous Type

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Sameh101 Chatterbug Forms Fast Flexible WordPress Form Builder affected 1.0.2 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/chatterbug-forms/tags/1.0.2/chatterbug-forms.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/chatterbug-forms/tags/1.0.2/chatterbug-forms.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/chatterbug-forms/tags/1.0.2/chatterbug-forms.php [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/7819c1fa-884b-4f1d-ba63-84057... [email protected] www.wordfence.com
plugins.trac.wordpress.org/changeset/3794492/chatterbug-forms/trunk/chatterbug-forms.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/chatterbug-forms/tags/1.0.2/chatterbug-forms.php [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: samathakeeling (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-11-10T08:32:15.000ZVendor Notified
CNA2026-11-12T21:10:49.000ZDisclosed

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