CVE-2026-62103

WordPress Everest Forms plugin <= 3.6.0 - PHP Object Injection vulnerability

Published Sep 11, 2026 CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed

Description

Unauthenticated PHP Object Injection in Everest Forms <= 3.6.0 versions.

Analysis

Technical impact

The vulnerability is an unauthenticated PHP Object injection in Everest Forms plugin versions up to 3.6.0. Attackers can send specially crafted serialized objects to trigger arbitrary object creation and code execution, potentially allowing full compromise of the hosted WordPress site.

Affected Systems

WordPress sites that have the Everest Forms plugin installed with a version 3.6.0 or earlier are affected. Any instance of the plugin without the update to 3.6.1 or later remains vulnerable.

Risk and Exploitability

The vulnerability carries a CVSS score of 9.8, indicating critical severity. The EPSS score is < 1%, but the lack of a C legitimate high exploitation risk, especially since the flaw is unauthenticated and can be triggered via crafted HTTP requests to the plugin’s endpoints. Remediation is urgent due to the simplicity of the injection payloads and the remote code execution potential.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

wpeverest

Everest Forms

unaffected

Version	Status	Constraints
`n/a`	affected	≤ 3.6.0

No data.

Vendor Product Versions

Wordpress

Version	Status	Scheme	Platform
`—`	unaffected	—	—

Wpeverest

Everest Forms

Version	Status	Scheme	Platform
`[0,3.6.0]`	affected	semver	—
`[3.6.1,*]`	unaffected	semver	—

Remediation

Vendor Solution

Update the WordPress Everest Forms Plugin to the latest available version (at least 3.6.1).

OpenCVE Recommended Actions

Upgrade the Everest Forms plugin to version 3.6.1 for the site.
If the plugin is no longer needed, deactivate and delete it to prevent any accidental exposure to malicious POST requests.
Configure a web application firewall to reject HTTP requests that contain PHP serialized objects by inspecting payloads for common serialization patterns.

Generated by OpenCVE AI on September 21, 2026 at 03:56 UTC.

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.564% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact total

References

Link	Providers
https://patchstack.com/database/wordpress/plugin/everest-forms/vulnerability/wordpress-everest-forms-plugin-3-6-0-php-object-injection-vulnerability?_s_id=cve

History

Sep 13, 2026 1:15 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Wordpress Wordpress wordpress Wpeverest Wpeverest everest Forms
Vendors & Products		Wordpress Wordpress wordpress Wpeverest Wpeverest everest Forms

Sep 12, 2026 11:30 AM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Sep 11, 2026 11:45 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		Unauthenticated PHP Object Injection in Everest Forms <= 3.6.0 versions.
Title		WordPress Everest Forms plugin <= 3.6.0 - PHP Object Injection vulnerability
Weaknesses		CWE-502
References		https://patchstack.com/database/wordpress/plugin/everest-forms/vulnerability/wordpress-everest-forms-plugin-3-6-0-php-object-injection-vulnerability?_s_id=cve
Metrics		cvssV3_1 `{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}`