CVE-2026-6675: CWE-20 Improper Input Validation in cyberchimps Responsive Blocks – Page Builder for Blocks & Patterns
The Responsive Blocks – Page Builder for Blocks & Patterns WordPress plugin up to version 2. 2. 0 contains an unauthenticated open email relay vulnerability. This occurs due to missing authorization checks and lack of server-side validation on the recipient email address in a public REST API endpoint. An attacker can exploit this to send arbitrary emails through the affected site's mail server without authentication, potentially abusing the site as an open mail relay. The vulnerability is tracked as CVE-2026-6675 with a medium severity rating and a CVSS score of 5. 3. No official patch or remediation guidance is currently available from the vendor. There are no known exploits in the wild at this time.
AI Analysis
Technical Summary
CVE-2026-6675 is an improper input validation vulnerability (CWE-20) in the Responsive Blocks – Page Builder for Blocks & Patterns WordPress plugin. The issue arises because the plugin's public REST API route does not enforce authorization or validate the recipient email address server-side. This allows unauthenticated attackers to send arbitrary emails via the WordPress site's mail server, effectively turning it into an open mail relay. The vulnerability affects all versions up to and including 2.2.0. The CVSS 3.1 base score is 5.3, reflecting network attack vector, low complexity, no privileges required, no user interaction, and impact limited to integrity (email sending abuse). No patch or official fix has been published yet.
Potential Impact
An attacker can exploit this vulnerability to send arbitrary emails through the affected WordPress site's mail server without authentication. This can lead to abuse of the site as an open mail relay, potentially facilitating spam campaigns or phishing attacks that appear to originate from the legitimate domain. There is no direct impact on confidentiality or availability reported. No known exploits are currently observed in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, consider disabling or restricting access to the vulnerable REST API endpoint if possible. Monitor for updates from the plugin vendor or WordPress security channels for an official patch or mitigation instructions.
CVE-2026-6675: CWE-20 Improper Input Validation in cyberchimps Responsive Blocks – Page Builder for Blocks & Patterns
Description
The Responsive Blocks – Page Builder for Blocks & Patterns WordPress plugin up to version 2. 2. 0 contains an unauthenticated open email relay vulnerability. This occurs due to missing authorization checks and lack of server-side validation on the recipient email address in a public REST API endpoint. An attacker can exploit this to send arbitrary emails through the affected site's mail server without authentication, potentially abusing the site as an open mail relay. The vulnerability is tracked as CVE-2026-6675 with a medium severity rating and a CVSS score of 5. 3. No official patch or remediation guidance is currently available from the vendor. There are no known exploits in the wild at this time.
CVSS v3.1
Score 5.3medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-6675 is an improper input validation vulnerability (CWE-20) in the Responsive Blocks – Page Builder for Blocks & Patterns WordPress plugin. The issue arises because the plugin's public REST API route does not enforce authorization or validate the recipient email address server-side. This allows unauthenticated attackers to send arbitrary emails via the WordPress site's mail server, effectively turning it into an open mail relay. The vulnerability affects all versions up to and including 2.2.0. The CVSS 3.1 base score is 5.3, reflecting network attack vector, low complexity, no privileges required, no user interaction, and impact limited to integrity (email sending abuse). No patch or official fix has been published yet.
Potential Impact
An attacker can exploit this vulnerability to send arbitrary emails through the affected WordPress site's mail server without authentication. This can lead to abuse of the site as an open mail relay, potentially facilitating spam campaigns or phishing attacks that appear to originate from the legitimate domain. There is no direct impact on confidentiality or availability reported. No known exploits are currently observed in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, consider disabling or restricting access to the vulnerable REST API endpoint if possible. Monitor for updates from the plugin vendor or WordPress security channels for an official patch or mitigation instructions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-04-20T14:13:26.851Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69e6e4ee19fe3cd2cd6b0eaf
Added to database: 4/21/2026, 2:46:06 AM
Last enriched: 4/28/2026, 6:08:19 AM
Last updated: 6/4/2026, 10:52:35 AM
Views: 88
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