CVE-2026-11855 — HIGH (8.8)

Vulnerability Description

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 Score

8.8

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

References

https://wpscan.com/vulnerability/217cb606-a0f2-4427-9262-cfe1cc90474e/

FAQ

What is CVE-2026-11855?

CVE-2026-11855 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 outputti...

How severe is CVE-2026-11855?

CVE-2026-11855 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-11855?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.