Essential Blocks <= 4.2.0 — Unauthenticated PHP Object Injection via products
CVE-2023-4402Published · Updated Action summary
Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns: Affected: ≤4.2.0Update to 4.2.1 or newer
Essential Blocks Pro: Affected: ≤1.1.0Update to 1.1.1 or newer
All remediation steps- Severity
- High8.1
- CVSS
- 8.1CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HWhat does this vector mean?
AV:NAttack vector- Network
AC:HAttack complexity- High
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:HConfidentiality- High
I:HIntegrity- High
A:HAvailability- High
- Weakness
- CWE-502 PHP Object Injection
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns essential-blocks
- Affected≤ 4.2.0
- Patched in4.2.1
Update to 4.2.1 or newer.
You are affected if you run ≤ 4.2.0. Version 4.2.1 and later are not affected by this issue.
Essential Blocks Pro essential-blocks-pro
- Affected≤ 1.1.0
- Patched in1.1.1
Update to 1.1.1 or newer.
You are affected if you run ≤ 1.1.0. Version 1.1.1 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 4.2.1, or a newer patched version
- Update to version 1.1.1, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Marco Wotschka.
The Essential Blocks plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 4.2.0 via deserialization of untrusted input in the get_products function. This allows unauthenticated attackers to inject a PHP Object. No POP chain is present in the vulnerable plugin. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns
All 34| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting via 'marker' Attribute ≤6.4.5Update to 6.4.6 | CVE-2026-96256 | |
| Medium5.3 | Unauthenticated Information Exposure ≤6.3.0Update to 6.4.0 | CVE-2026-13154 | |
| Medium5.3 | Unauthenticated Information Exposure ≤6.3.0Update to 6.4.0 | CVE-2026-13153 | |
| Medium6.4 | Page Builder for Gutenberg Blocks & Patterns <= 6.1.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'configurablePrefix' Block Attribute ≤6.1.4Update to 6.2.0 | CVE-2026-10833 | |
| High7.2 | Authenticated (Author+) Server-Side Request Forgery ≤6.1.3Update to 6.1.4 | CVE-2026-10586 |
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via 'marker' Attribute
≤6.4.5Update to 6.4.6
- Medium5.3Unauthenticated Information Exposure
≤6.3.0Update to 6.4.0
- Medium5.3Unauthenticated Information Exposure
≤6.3.0Update to 6.4.0
- Medium6.4Page Builder for Gutenberg Blocks & Patterns <= 6.1.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'configurablePrefix' Block Attribute
≤6.1.4Update to 6.2.0
- High7.2Authenticated (Author+) Server-Side Request Forgery
≤6.1.3Update to 6.1.4
Same weakness (PHP Object Injection)
All PHP Object Injection| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
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ELEX WordPress HelpDesk & Customer Ticketing System
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- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
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Timeline
CVE published
Severity high, CVSS 8.1
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- [object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.