CVE-2026-4365

CriticalUpdated

Published: 14 April 2026

Published

14 April 2026

Modified

22 April 2026

KEV Added

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Patch

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CVSS Score 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

EPSS Score 0.0010 27.5th percentile

Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-4365 is a critical-severity Missing Authorization (CWE-862) vulnerability in Wordpress (inferred from references). Its CVSS base score is 9.1 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 27.5th 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-22 (Publicly Accessible Content) and AC-3 (Access Enforcement).

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

Enforces approved authorizations for access to system resources, directly mitigating the missing capability and ownership checks in the delete_question_answer function.

AC-6 Least Privilege good match

prevent

Employs least privilege to restrict unauthenticated attackers from executing destructive actions like quiz answer deletion.

AC-22 Publicly Accessible Content good match

prevent

Controls access to and use of publicly accessible content such as the exposed wp_rest nonce in lpData and the lp-load-ajax endpoint.

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 →

T1485 Data Destruction Impact

Adversaries may destroy data and files on specific systems or in large numbers on a network to interrupt availability to systems, services, and network resources.

attack.mitre.org →

Why these techniques?

The vulnerability is a remote unauthenticated flaw in a public-facing WordPress plugin (LearnPress) that allows crafted requests to delete arbitrary data via an exposed nonce and missing authorization checks, directly enabling T1190 (Exploit Public-Facing Application) for initial exploitation and T1485 (Data Destruction) for the resulting unauthorized deletion impacting integrity and availability.

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

NVD Description

The LearnPress plugin for WordPress is vulnerable to unauthorized data deletion due to a missing capability check on the `delete_question_answer()` function in all versions up to, and including, 4.3.2.8. The plugin exposes a `wp_rest` nonce in public frontend HTML (`lpData`)…

to unauthenticated visitors, and uses that nonce as the only security gate for the `lp-load-ajax` AJAX dispatcher. The `delete_question_answer` action has no capability or ownership check. This makes it possible for unauthenticated attackers to delete any quiz answer option by sending a crafted POST request with a publicly available nonce.

Deeper analysisAI

CVE-2026-4365 is a vulnerability in the LearnPress plugin for WordPress, affecting all versions up to and including 4.3.2.8. It enables unauthorized data deletion due to a missing capability check on the `delete_question_answer()` function. The plugin exposes a `wp_rest` nonce in public frontend HTML via the `lpData` object, making it accessible to unauthenticated visitors. This nonce acts as the only security mechanism for the `lp-load-ajax` AJAX dispatcher, while the `delete_question_answer` action performs no capability or ownership verification.

Unauthenticated attackers can exploit this vulnerability remotely by sending a crafted POST request to the `lp-load-ajax` endpoint, incorporating the publicly available nonce. Successful exploitation allows deletion of any quiz answer option, regardless of ownership. The issue carries a CVSS v3.1 base score of 9.1 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H), indicating high-impact disruption to data integrity and availability with low complexity and no required privileges.

Advisories reference specific code locations in the plugin, including line 33 of `AbstractAjax.php` for AJAX handling, line 285 of `EditQuestionAjax.php` for the vulnerable function, and line 177 of `class-lp-assets.php` for nonce exposure in frontend assets. The Wordfence threat intelligence page details the vulnerability under ID 021bd566-1663-46ba-a616-ab554b691cbb.