Nexa Blocks <= 1.1.1 - Unauthenticated Blind Server-Side Request Forgery via 'demo_json_file' Parameter

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-6394
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-20 02:16:37 UTC
Updated2026-05-20 13:54:54 UTC
DescriptionThe Nexa Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE plugin for WordPress is vulnerable to Server-Side Request Forgery (SSRF) in versions up to and including 1.1.1. This is due to the import_demo() function accepting a user-supplied URL in the demo_json_file POST parameter and passing it directly to wp_remote_get() without any URL validation or restriction against internal or private network destinations. The nexa_blocks_nonce required for the AJAX action is publicly exposed in the HTML source of any frontend page where the plugin is active via wp_localize_script on the enqueue_block_assets hook, effectively making the nonce available to all visitors and bypassing any intended authentication barrier. This makes it possible for unauthenticated attackers to make server-side HTTP requests to arbitrary internal or external destinations, potentially exposing internal services, cloud metadata endpoints such as the AWS instance metadata service, localhost services, and other resources not intended to be publicly accessible. A secondary SSRF vector also exists whereby image URLs extracted from the attacker-controlled JSON response are subsequently fetched via a second wp_remote_get() call, allowing chained exploitation through a crafted JSON payload.

Risk And Classification

Primary CVSS: v3.1 5.4 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS: 0.001000000 probability, percentile 0.271720000 (date 2026-05-27)

Problem Types: CWE-918 | CWE-918 CWE-918 Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED5.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Wpdive Nexa Blocks Gutenberg Blocks Page Builder For Gutenberg Editor FSE affected 1.1.1 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/nexa-blocks/trunk/inc/template/template.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/nexa-blocks/tags/1.1.1/inc/template/template.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/nexa-blocks/tags/1.1.1/inc/classes/enqueue-assets.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/nexa-blocks/tags/1.1.1/inc/template/template.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/nexa-blocks/trunk/inc/classes/enqueue-assets.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/nexa-blocks/trunk/inc/template/template.php [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/b4bb3067-7953-466d-a469-8a101... [email protected] www.wordfence.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Patryk Siewert (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-05-19T12:03:46.000ZDisclosed
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