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Chatterbug Forms remote code execution via unrestricted form file upload

CVE-2026-125055EUVD-2026-124979GHSA-QP25-GV7G-X5J9

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

9.8CriticalCNA
Exploited
No known exploitation
Fix
No fix listed
Who is exposed
Not reported
Published
Last modified
Reference
Last checked
1.14% · 67th percentile
35/100 · provisional
None on Exploit-DB, Metasploit or GitHub
On X
View the cve.now post
  • Exploitation: none
  • Automatable: yes
  • Technical impact: total

Summary

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.

cve.now Index

35Pcve.now Index 35 of 100 · methodology v3 · provisional
  • Exploitation0/40No signal
  • Exposure20/25No login or user action needed per the CVSS vector, CISA rates it automatable · Unknown: No advisory context yet
  • Reach?/20Unknown. No tracked technology or package matched
  • Severity10/10CVSS 9.8, total technical impact per CISA
  • No patch5/5No patch listed yet

What would change the score

  • Would score about 80 if added to CISA KEV
  • Would score about 75 if CISA's SSVC rates exploitation active
  • Would score about 40 if advisories confirm default setups are exposed

How the score works · Rankings

Check your systems with an agent

Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.

Check whether my systems are affected by CVE-2026-125055 (Chatterbug Forms <= 1.0.2 - Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-125055 (entry last updated 2026-11-13):
Affected:
- sameh101 Chatterbug Forms – Fast, Flexible WordPress Form Builder: through 1.0.2
Fixed versions: none listed yet.
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
CISA KEV: CVE-2026-125055 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-125055 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- 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
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-125055
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-125055"}.

Timeline

  1. CVE published
  2. First seen by cve.now
  3. Posted on X by cve.now
  4. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: total

  5. Record last updated

Affected versions

  • sameh101 Chatterbug Forms – Fast, Flexible WordPress Form Builder

    through 1.0.2

Evidence 8

Vendor advisory · 5

Establishes: Affected and fixed versions.

  1. Link
  2. Link
  3. Link
  4. Link
  5. Link

CVE record · 2

Establishes: The identifier and description.

  1. Record
  2. Record

Other links · 1

  1. Link

Corrections

None so far.

Something wrong on this page? Report an error. Every fix is listed here.

Questions about CVE-2026-125055

Is CVE-2026-125055 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data

Which versions are affected by CVE-2026-125055?

Chatterbug Forms – Fast, Flexible WordPress Form Builder: through 1.0.2.Source: cve.now feed data

Sources

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