CVE-2026-125055sameh101 Chatterbug Forms unrestricted file upload

High priorityCritical9.8EPSS 1.1%

CVE-2026-125055 is a unrestricted file upload in sameh101 Chatterbug Forms, rated critical (9.8 on CVSS 3.1).

Why this priority: Critical, and reachable over the network without an account.

Published 13 Nov 2026 · Updated 13 Nov 2026 · NVD status: Deferred

What it is

Files of dangerous types can be uploaded, and the server may run or serve them.

How it is reached

An attacker can exploit it over the network, without an account, and nobody has to click anything.

What an attacker gains

A successful attack can read the data it protects, change data or behaviour and take it offline. In practice, this kind of flaw lets an attacker place a file the server will run or serve to others.

Is it being exploited?

There is no public report of exploitation yet. EPSS estimates a 1.1% chance of exploitation activity in the next 30 days, higher than 67% of scored CVEs.

What to do

No fixed version is listed yet. Find every place sameh101 Chatterbug Forms runs, watch the references for a fix, and plan a replacement if it is no longer supported.
While there is no fix, keep it off the internet or behind a VPN, allowlist or authenticating proxy.

Description from NVD

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 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.

What this means for your architecture.

A CVE names a product. Whether it matters depends on where that product sits in your systems: what reaches it, which trust boundary it guards and what it can reach once compromised. Veriom maps your components, their relationships and your trust boundaries from your code, cloud and delivery evidence, so you can see where a component like this sits. The radar itself does not look at your systems.

Components it touches

WordPress sites and their plugins. Plugins run inside the site with its database access, and many sites are public.
Upload endpoints and the storage behind them. The flaw sits between uploaded content and the servers that store or serve it.

Trust boundaries in play

Internet-facing entry points. No account is needed. Any instance reachable from outside your perimeter, through a load balancer, gateway, VPN or exposed admin port, is in scope.
Between uploaded content and the servers that store or serve it. An attacker who crosses it can place a file the server will run or serve to others.

Questions to answer about your own systems

Where does sameh101 Chatterbug Forms run in your systems, and at which version?
Which of those instances can be reached from the internet or partner networks?
What can it reach once compromised: which data stores, secrets and services?

See how Veriom maps an architecture Take the interactive tour

Advisories

www.wordfence.com/threat-intel/vulnerabilities/id/7819c1fa-884b-4f1d-ba63-84057bf6da84?source=cve

Sources

CVE records and CVSS scores from the NVD CVE API. This product uses the NVD API but is not endorsed or certified by the NVD.
Exploitation status from CISA’s Known Exploited Vulnerabilities catalog.
Exploit likelihood from FIRST’s Exploit Prediction Scoring System (EPSS), refreshed daily.
Explanations are written by Veriom from fixed templates over each record’s data, not by a person reviewing each CVE. Descriptions are quoted from the records as published.