# CVE-2026-125055: Chatterbug Forms <= 1.0.2 - Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission

Status: published. Published: 2026-11-13. Updated: 2026-11-13.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- sameh101 / Chatterbug Forms – Fast, Flexible WordPress Form Builder: ≥ 0; ≤ 1.0.2 (affected, semver). Source: CNA: Wordfence

## Severity and prioritization

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: Wordfence

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: NVD: security@wordfence.com

- CISA KEV: No listing in collected sources

- EPSS: 1.14% as of 2026-11-13; percentile 67.14%

- SSVC: exploitation none; automatable yes; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-434

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/7819c1fa-884b-4f1d-ba63-84057bf6da84?source=cve (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/chatterbug-forms/tags/1.0.2/chatterbug-forms.php#L422 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/chatterbug-forms/tags/1.0.2/chatterbug-forms.php#L331 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/chatterbug-forms/tags/1.0.2/chatterbug-forms.php#L510 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/chatterbug-forms/tags/1.0.2/chatterbug-forms.php#L308 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/changeset/3794492/chatterbug-forms/trunk/chatterbug-forms.php (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/chatterbug-forms/tags/1.0.2/chatterbug-forms.php#L308 (security@wordfence.com)

- https://plugins.trac.wordpress.org/browser/chatterbug-forms/tags/1.0.2/chatterbug-forms.php#L331 (security@wordfence.com)

- https://plugins.trac.wordpress.org/browser/chatterbug-forms/tags/1.0.2/chatterbug-forms.php#L422 (security@wordfence.com)

- https://plugins.trac.wordpress.org/browser/chatterbug-forms/tags/1.0.2/chatterbug-forms.php#L510 (security@wordfence.com)

- https://plugins.trac.wordpress.org/changeset/3794492/chatterbug-forms/trunk/chatterbug-forms.php (security@wordfence.com)

- https://www.wordfence.com/threat-intel/vulnerabilities/id/7819c1fa-884b-4f1d-ba63-84057bf6da84?source=cve (security@wordfence.com)

## Provenance

- CNA: Wordfence: https://www.cve.org/CVERecord?id=CVE-2026-125055; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-125055; retrieved 2026-11-14; source updated 2026-11-13

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-125055; retrieved 2026-11-13; source updated Not reported

Revision: 64e79a1652c45147fbc89776e89c6f8d5d7fb9e4d49924ba4e681c50ce02be67

Canonical: https://y2.dev/cve/CVE-2026-125055

## Agent and API access

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- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.