CVE-2026-4100

High

Published: 02 May 2026

Published

02 May 2026

Modified

05 May 2026

KEV Added

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Patch

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CVSS Score 7.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

EPSS Score 0.0004 12.4th percentile

Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-4100 is a high-severity Missing Authorization (CWE-862) vulnerability in Wordfence (inferred from references). Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 12.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and AC-6 (Least Privilege).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

AC-3 Access Enforcement good match

prevent

Directly requires enforcement of approved authorizations, addressing the missing capability checks on the vulnerable AJAX handlers that allow unauthorized Stripe webhook modifications.

AC-6 Least Privilege good match

prevent

Enforces least privilege to prevent subscriber-level users from accessing or modifying critical Stripe webhook configurations.

CM-5 Access Restrictions for Change good match

prevent

Restricts access to mechanisms that change system configurations, such as the AJAX handlers altering Stripe webhook settings.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1068 Exploitation for Privilege Escalation Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

attack.mitre.org →

Why these techniques?

Vulnerability in public-facing WordPress plugin with missing authorization on AJAX handlers allows low-privilege authenticated users to modify/disrupt Stripe webhook config, enabling exploitation of public-facing apps (T1190) and privilege escalation via unauthorized actions (T1068).

Confidence: MEDIUM · MITRE ATT&CK Enterprise v18.1

NVD Description

The Paid Memberships Pro plugin for WordPress is vulnerable to unauthorized modification and disruption of Stripe webhook configuration in all versions up to, and including, 3.6.5. This is due to missing capability checks on the `wp_ajax_pmpro_stripe_create_webhook`, `wp_ajax_pmpro_stripe_delete_webhook`, and `wp_ajax_pmpro_stripe_rebuild_webhook` AJAX…

handlers. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete, create, or rebuild the site's Stripe webhook, disrupting all payment processing, subscription renewal synchronization, cancellation handling, and failed payment management.

Deeper analysisAI

CVE-2026-4100 is a vulnerability in the Paid Memberships Pro plugin for WordPress, affecting all versions up to and including 3.6.5. It stems from missing capability checks on the AJAX handlers `wp_ajax_pmpro_stripe_create_webhook`, `wp_ajax_pmpro_stripe_delete_webhook`, and `wp_ajax_pmpro_stripe_rebuild_webhook`, enabling unauthorized modification and disruption of Stripe webhook configuration. The issue is rated with a CVSS v3.1 base score of 7.1 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H) and maps to CWE-862 (Missing Authorization).

Authenticated attackers with Subscriber-level access or higher can exploit this vulnerability over the network with low complexity and no user interaction. By invoking the affected AJAX endpoints, they can create, delete, or rebuild the site's Stripe webhook, which disrupts critical payment processing functions including subscription renewal synchronization, cancellation handling, and failed payment management.

Mitigation details are available in advisories such as the Wordfence threat intelligence report at https://www.wordfence.com/threat-intel/vulnerabilities/id/5b333a3d-e416-42aa-9722-5406df0a64b3?source=cve and a patch via the GitHub pull request at https://github.com/strangerstudios/paid-memberships-pro/pull/3615. WordPress site administrators using the plugin should update to a version beyond 3.6.5 to address the missing authorization checks.