# CVE-2026-10196: Mail Mint PHP Object Injection via deserialization

Source: https://junglewise.ai/threats/cve-2026-10196-mail-mint-php-object-injection-via-deserialization  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-05. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-10196 · Severity: critical · CVSS 9.8 · Published 2026-09-05

Mail Mint is a WordPress plugin for email marketing, newsletters, and WooCommerce integration. The plugin fails to safely validate input before deserializing PHP objects, allowing unauthenticated attackers to inject malicious code and achieve remote code execution on affected WordPress sites.

## Quick answers

**Is CVE-2026-10196 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-10196 being exploited in the wild.

**How severe is CVE-2026-10196?** Critical severity, with a CVSS score of 9.8, published 5 September 2026.

**Which products and versions are affected?** Mail Mint Mail Mint up to and including 1.31.0.

**Is there a fix for CVE-2026-10196?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-10196 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-10196?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a PHP Object Injection (CWE-502) in the 'handle_form_submission' function, caused by unsafe deserialization of user-controlled input. Because the plugin processes untrusted data without validation and a gadget chain (POP chain) is available in the environment, an unauthenticated attacker can craft a malicious serialized object to achieve arbitrary code execution. The attack is network-accessible and requires no authentication or user interaction. A partial patch was issued in version 1.23.1, but the vulnerability remained exploitable in subsequent versions up to and including 1.31.0.

## Affected products

- Mail Mint Mail Mint up to and including 1.31.0

## Timeline

- 2026-09-05: disclosed

## References

- [https://plugins.trac.wordpress.org/browser/mail-mint/tags/1.21.0/app/API/Actions/Frontend/FormAction.php](https://plugins.trac.wordpress.org/browser/mail-mint/tags/1.21.0/app/API/Actions/Frontend/FormAction.php)
- [https://plugins.trac.wordpress.org/browser/mail-mint/tags/1.21.0/app/Database/models/ContactModel.php](https://plugins.trac.wordpress.org/browser/mail-mint/tags/1.21.0/app/Database/models/ContactModel.php)