Gutenberg Essential Blocks <= 6.4.5 — Authenticated (Contributor+) Stored Cross-Site Scripting via 'marker' Attribute
CVE-2026-96256Published · Updated Action summary
Affected: ≤6.4.5Update to 6.4.6 or newer
All remediation steps- Severity
- Medium6.4
- CVSS
- 6.4CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:CScope- Changed
C:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- None
- Weakness
- CWE-79 Cross-Site Scripting
- Required access
- Unknown
- 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≤ 6.4.5
- Patched in6.4.6
Update to 6.4.6 or newer.
You are affected if you run ≤ 6.4.5. Version 6.4.6 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.
What to do
- Update to version 6.4.6, 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 Webbernaut.
The Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Google Map block's 'marker' attribute in versions up to, and including, 6.4.5 This is due to insufficient input sanitization and output escaping on marker title/content values, which are stored as JSON and then decoded and concatenated directly into raw HTML by the frontend script's InfoWindow content builder. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
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 |
|---|---|---|---|
| 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 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting via Block Attributes ≤6.0.4Update to 6.1.0 | CVE-2026-4658 |
- 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
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via Block Attributes
≤6.0.4Update to 6.1.0
Same weakness (Cross-Site Scripting)
All Cross-Site Scripting| 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
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
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Timeline
CVE published
Severity medium, CVSS 6.4
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.