Vulnerability · Published Feb 19, 2026 · Assigned by Wordfence
CVE-2026-1461Simple Membership <= 4.7.0 - Unauthenticated Improper Handling of Missing Values
Medium 6.5
In plain English
A medium-severity security flaw in Simple Membership from wpinsider-1. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| wpinsider-1 | Simple Membership | 0 – through 4.7.0 |
Weakness: CWE-230 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/4e4df9a6-8f7d-428b-a596-0751ca047169?source=cve
- https://plugins.trac.wordpress.org/browser/simple-membership/trunk/ipn/swpm-stripe-webhook-handler.php#L26
- https://plugins.trac.wordpress.org/browser/simple-membership/trunk/classes/class.swpm-wp-loaded-tasks.php#L90
- https://plugins.trac.wordpress.org/changeset/3453404/