What’s Vulnerable › Vulnerabilities
CVE-2026-14936: Simple Membership < 4.7.7 - Unauthenticated Payment Bypass via Missing PayPal IPN Receiver Verification
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-06 · updated 2026-08-26
- Weakness: CWE-345
Description
The Simple Membership WordPress plugin before 4.7.7 does not verify that a PayPal payment notification was sent to the site's own configured merchant account before activating a membership, allowing unauthenticated users to activate or extend a membership using a payment made to an arbitrary PayPal account they control.
Affected products
- Simple Membership: before 4.7.7 — fixed in 4.7.7
How to fix
Upgrade to a fixed version: Simple Membership 4.7.7. Check the vendor advisory for mitigations.
References
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