CVE-2026-11855
Simple Membership < 4.7.5 - Unauthenticated Stored XSS via Stripe Webhook API Version
Vexday Risk Score
41Attention
SSVC decision (CISA)
Attend
PoC available → attend closely
Exploit maturity
Proof of concept
Public proof of concept exists, but not yet automated.
CVSS 8.8EPSS 0.3%KEV nãoPoC públicaNuclei —Metasploit —Patch —
Lifecycle
06 Jul 2026Published on NVD
Recommendation: Plan a near-term fix — a public PoC already exists.
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected products
Unknown · Simple Membershippublic PoCs found — 1
cve_referencewpscan.com/vulnerability/217cb606-a0f2-4427-9262-cfe1cc90474e/unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.