Everest Forms <= 3.4.3 - Unauthenticated PHP Object Injection via Form Entry Metadata
Published Apr 8, 2026
9.8
CRITICALCVSS 3.1
EPSS 2.98%
Description
The Everest Forms plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.4.3 via deserialization of untrusted input from form entry metadata. This is due to the html-admin-page-entries-view.php file calling PHP's native unserialize() on stored entry meta values without passing the allowed_classes parameter. This makes it possible for unauthenticated attackers to inject a serialized PHP object payload through any public Everest Forms form field. The payload survives sanitize_text_field() sanitization (serialization control characters are not stripped) and is stored in the wp_evf_entrymeta database table. When an administrator views entries or views an individual entry, the unsafe unserialize() call processes the stored data without class restrictions.
Affected products
- Vendor Wpeverest Product Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder Defaultunaffected
- Version 0StatusaffectedConstraints<=3.4.3
- Version
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 – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder | unaffected |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
TotalDecision
n/aAssessed Apr 8, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
Apr–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (4 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 2.98% (0.02977) | 86.81th | v5 (v2026.06.15) |
| Jul 22, 2026 | 3.47% (0.03469) | 87.84th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.88% (0.00878) | 54.17th | v5 (v2026.06.15) |
| Apr 8, 2026 | 0.02% (0.00020) | 5.28th | v4 (v2025.03.14) |
References (6)
- https://plugins.trac.wordpress.org/browser/everest-forms/tags/3.4.3/includes/admin/views/html-admin-page-entries-view.php#L133
- https://plugins.trac.wordpress.org/browser/everest-forms/tags/3.4.3/includes/evf-core-functions.php#L5594
- https://plugins.trac.wordpress.org/browser/everest-forms/trunk/includes/admin/views/html-admin-page-entries-view.php#L133
- https://plugins.trac.wordpress.org/changeset/3489938/everest-forms/tags/3.4.4/readme.txt?old=3464753&old_path=everest-forms%2Ftags%2F3.4.3%2Freadme.txt
- https://plugins.trac.wordpress.org/changeset?old_path=/everest-forms/tags/3.4.3&new_path=/everest-forms/tags/3.4.4
- https://www.wordfence.com/threat-intel/vulnerabilities/id/2693ae37-790d-4b18-a9ec-054c8c27b8bc?source=cve
Change history (0)
No recorded changes yet.