CVE-2026-89101

Everest Forms <= 3.6.2 - Insecure Direct Object Reference to Authenticated (Custom+) Arbitrary Entry/Form Disclosure and Deletion via MCP /tools/call JSON-RPC Endpoint

2026-11-05 22:19
Trgomez

Strategic Overview

Status
Patched in 3.6.3
Affected Plugin
Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI
Affected Version
<= 3.6.2
CVSS
6.5Medium
Weakness type
CWE-639 · Authorization Bypass Through User-Controlled Key
CVE
CVE-2026-89101
View all Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI vulnerabilities

At a glance

CVE-2026-89101 is a medium-severity Authorization Bypass Through User-Controlled Key vulnerability in the Everest Forms WordPress plugin, affecting versions <= 3.6.2. It carries a CVSS score of 6.5 (reachable over the network; low attack complexity; high confidentiality impact). Exploitation requires an authenticated account at Custom level or above. The issue is fixed in version 3.6.3; sites on affected versions should update now. Disclosed November 2026, reported by Trgomez.

Vulnerability Overview

The Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 3.6.2 via the get_entry due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with custom-level access and above, to view, read, and permanently delete forms and entries belonging to any other user — including personally identifiable information submitted through public contact and lead forms — regardless of form ownership.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user. A successful exploit has high impact on confidentiality.

CWE-639: Authorization Bypass Through User-Controlled Key

Reaching this weakness in Everest Forms <= 3.6.2 takes an account at Custom level or above. Authorization bypass through a user-controlled key, often called insecure direct object reference, means the application looks up a record by an identifier from the request without checking that the caller owns it.

Changing a number in the request is enough to read or modify other users' records, which on commerce and membership sites means customer data. For Everest Forms the fix is 3.6.3: builds <= 3.6.2 are affected, anything from 3.6.3 onward is not.

Remediation

Update to version 3.6.3, or a newer patched version

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Everest Forms 3.6.3 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-89101https://www.wordfence.com/threat-intel/vulnerabilities/id/1fabe52a-b51e-4383-ac88-8f30e083c9bbhttps://nvd.nist.gov/vuln/detail/CVE-2026-89101

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C