# CVE-2026-118235: SimpleForm <= 3.10.2 - Unauthenticated Arbitrary File Upload via Trailing-Dot Filename via Unknown File Key in simpleform_get_submit_data

Status: published. Published: 2026-10-31. Updated: 2026-11-02.

The SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.10.2 via the handle_upload function. This is due to missing server-side file key allowlist and pre-sanitization extension derivation that allows a trailing-dot filename to bypass all extension and MIME validation in handle_upload. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. The only access control is a nonce that is printed into every public form's data-nonce attribute, making it trivially obtainable by any unauthenticated visitor on a page embedding the form shortcode.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- wpazleen / SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications: ≥ 0; ≤ 3.10.2 (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

- CISA KEV: No listing in collected sources

- EPSS: 0.74% as of 2026-11-02; percentile 54.60%

- 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/6aac2178-f6ce-4444-9afc-7e014547cd48?source=cve (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/FileUpload.php#L142 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/FileUpload.php#L118 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/FileUpload.php#L137 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/Ajax/Tables.php#L988 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/Ajax/Tables.php#L67 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/Ajax/Tables.php#L973 (CNA: Wordfence)

- https://plugins.svn.wordpress.org/simple-form/trunk/ (CNA: Wordfence)

- https://plugins.trac.wordpress.org/changeset/3770697/simple-form/trunk/app/FileUpload.php (CNA: Wordfence)

## Provenance

- CNA: Wordfence: https://www.cve.org/CVERecord?id=CVE-2026-118235; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-118235; retrieved 2026-11-02; source updated Not reported

Revision: ad02a0ab7dce21f1f6eb1edf7b05afab6daaee4c7c1bd510ad28854aa45bfda9

Canonical: https://y2.dev/cve/CVE-2026-118235

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- 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.