CVE-2026-11855

Simple Membership < 4.7.5 - Unauthenticated Stored XSS via Stripe Webhook API Version

High · published July 6, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
42.2
In the wild
Unconfirmed
What it is

The Simple Membership WordPress plugin before 4.7.5 does not verify the authenticity of Stripe webhook requests when no signing secret is configured, nor escape a value taken from them before outputting it in an administrator notice, allowing unauthenticated attackers to inject arbitrary web scripts that execute in the context of a logged-in administrator.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00505 · 42.2th percentile
Published
2026-07-06T06:00Z
EPSS history
Timeline
  • 06 JUL 06:00Z
    Simple Membership < 4.7.5 - Unauthenticated Stored XSS via Stripe Webhook API Version
    cvelistv5