PHP: remote code execution

PHP

The Gravity Forms plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.1.2 via a Post Custom Field whose input type is List. This is due to GFFormsModel::create_post() passing the submitted value to WordPress' unrestricted global maybe_unserialize() rather than the plugin's own hardened…

Do this now

Check the Gravity Forms vendor advisory for a fix and restrict access to affected forms meanwhile.

Still cooking for Gravity Forms.

First seen: 31 Oct 2026
Last update: 31 Oct 2026, 16:17 UTC
Identifiers: CVE-2026-103039
CVSS: 9.8
Source: news
On the menu as: PHP

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## PHP: remote code execution
Severity: critical. Patch status: fix status unknown.
Affected: PHP
Ids: CVE-2026-103039

The Gravity Forms plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.1.2 via a Post Custom Field whose input type is List. This is due to GFFormsModel::create_post() passing the submitted value to WordPress' unrestricted global maybe_unserialize() rather than the plugin's own hardened…

## Steps
1. Search the repo, its CI and infra config for PHP. If present, report the version in use and whether it's affected.
2. Gravity Forms <= 3.1.2: the CVE record names no fix; check the vendor advisory before assuming there is none. Until one ships: restrict network access to it.

## Fix by release line
| Line | State | Fix | Until then |
|---|---|---|---|
| Gravity Forms <= 3.1.2 | not named in the CVE record | check the vendor advisory: https://docs.gravityforms.com/ | restrict network access to it |

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-103039") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://docs.gravityforms.com/ https://nvd.nist.gov/vuln/detail/CVE-2026-103039
https://pwned.coffee/i/the-gravity-forms-plugin-for-wordpress-is-vulnerable-to-cve-2026-103039

Receipt

Exploitation: No known exploitation
Fix by release line: Product Affected Fixed in Source
Gravity Forms <= 3.1.2 fix not named in the CVE record: see vendor advisory CVE record (CNA) checked 31 Oct
The CVE record names no fix for one line; the vendor’s advisory may: docs.gravityforms.com
Score: CVSS 9.8 (critical). CVSS 3.1 9.8 (CNA Wordfence) for CVE-2026-103039
Last checked: 31 Oct 2026, 17:17 UTC

Product	Affected	Fixed in	Source
Gravity Forms	<= 3.1.2	fix not named in the CVE record: see vendor advisory	CVE record (CNA) checked 31 Oct

Sources: KEV – CVE record ✓ Vendor ✓

Sources

Wrong fix version, or a source we missed? Send it back to chef@pwned.coffee with the source, and we'll correct it here.

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