Simple Membership <= 4.7.0 - Unauthenticated Improper Handling of Missing Values

Improper Handling of Missing Values
CVE CVE-2026-1461
CVSS Medium (6.5)
Publicly Published February 18, 2026
Last Updated February 19, 2026
Researcher 0N0ise
Description

The Simple Membership plugin for WordPress is vulnerable to Improper Handling of Missing Values in all versions up to, and including, 4.7.0 via the Stripe webhook handler. This is due to the plugin only validating webhook signatures when the stripe-webhook-signing-secret setting is configured, which is empty by default. This makes it possible for unauthenticated attackers to forge Stripe webhook events to manipulate membership subscriptions, including reactivating expired memberships without payment or canceling legitimate subscriptions, potentially leading to unauthorized access and service disruption.

References

1 affected software package

Software Type Plugin
Software Slug simple-membership (view on wordpress.org)
Patched? Yes
Affected Version
  • <= 4.7.0
Patched Version
  • 4.7.1
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