# CVE-2026-12093: Simple Membership WordPress plugin authorization bypass in Stripe webhooks

Source: https://junglewise.ai/threats/cve-2026-12093-simple-membership-wordpress-plugin-authorization-bypass-in-stripe  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-18. Updated: 2026-06-20  
License: CC BY 4.0 with a link back

CVE-2026-12093 · Severity: medium · CVSS 5.3 · Published 2026-06-18

The Simple Membership plugin for WordPress, which manages user subscriptions and access, contains a flaw that allows unauthorized individuals to deactivate member accounts. By sending a fake payment refund notification, an attacker can trick the system into marking a legitimate user's account as inactive. This can lead to service disruptions for customers and automated cancellation emails being sent without cause.

## Quick answers

**Is CVE-2026-12093 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-12093 being exploited in the wild.

**How severe is CVE-2026-12093?** Medium severity, with a CVSS score of 5.3, published 18 June 2026.

**Which products and versions are affected?** wpinsider-1 Simple Membership up to, and including, 4.7.5.

**Is there a fix for CVE-2026-12093?** 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-2026-12093 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-12093?** 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 Simple Membership plugin for WordPress suffers from a missing authorization check (CWE-862) in its Stripe webhook handling logic. Unauthenticated attackers can forge a 'charge.refunded' webhook event containing a target's subscription ID. If the 'stripe-webhook-signing-secret' is not configured (the default state), the plugin fails to verify the authenticity of the request via HMAC, subsequently setting the member's 'account_state' to 'inactive'. This triggers cancellation hooks and modifies transaction records. The vulnerability is mitigated if a webhook signing secret is properly configured.

## Affected products

- wpinsider-1 Simple Membership up to, and including, 4.7.5

## Timeline

- 2026-06-18: disclosed
- 2026-06-18: advisory

## References

- [https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.3/classes/class.swpm-wp-loaded-tasks.php](https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.3/classes/class.swpm-wp-loaded-tasks.php)
- [https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.3/ipn/swpm-stripe-webhook-handler.php](https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.3/ipn/swpm-stripe-webhook-handler.php)
- [https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.3/ipn/swpm-stripe-webhook-handler.php](https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.3/ipn/swpm-stripe-webhook-handler.php)
- [https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.3/ipn/swpm_handle_subsc_ipn.php](https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.3/ipn/swpm_handle_subsc_ipn.php)
- [https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.4/classes/class.swpm-wp-loaded-tasks.php](https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.4/classes/class.swpm-wp-loaded-tasks.php)
- [https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.4/ipn/swpm-stripe-webhook-handler.php](https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.4/ipn/swpm-stripe-webhook-handler.php)
- [https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.4/ipn/swpm-stripe-webhook-handler.php](https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.4/ipn/swpm-stripe-webhook-handler.php)