CVE-2026-7618: EnvíaloSimple WordPress Plugin SQLi Flaw

CVE-2026-7618 Overview

CVE-2026-7618 is a time-based blind SQL Injection vulnerability in the EnvíaloSimple: Email Marketing y Newsletters plugin for WordPress. The flaw affects all versions up to and including 2.4.5. The vulnerability resides in the orderby parameter, where insufficient escaping and a lack of query preparation allow authenticated attackers with administrator-level access to append additional SQL queries to existing database calls. Successful exploitation enables extraction of sensitive information from the WordPress database, including user credentials and session data. The issue is tracked under CWE-89: Improper Neutralization of Special Elements used in an SQL Command.

Critical Impact

Authenticated administrators can extract arbitrary data from the WordPress database through time-based blind SQL injection in the orderby parameter.

Affected Products

• EnvíaloSimple: Email Marketing y Newsletters plugin for WordPress (all versions ≤ 2.4.5)
• WordPress installations running the vulnerable plugin in api/contactform7.php and api/index.php
• Sites where administrator accounts are shared or weakly protected

Discovery Timeline

• 2026-05-27 - CVE-2026-7618 published to NVD
• 2026-05-27 - Last updated in NVD database

Technical Details for CVE-2026-7618

Vulnerability Analysis

The vulnerability stems from improper handling of the orderby parameter in the plugin's API endpoints. According to the Wordfence Vulnerability Analysis, the plugin constructs SQL queries by concatenating user-supplied input without using $wpdb->prepare() placeholders or esc_sql() sanitization. An attacker supplies SQL payloads through the orderby parameter that get injected directly into the ORDER BY clause of the query. Because ORDER BY cannot be parameterized with traditional placeholders, developers must validate input against an allowlist — a control absent in this plugin.

The injection is time-based blind, meaning attackers infer data by measuring response delays from payloads using SLEEP() or BENCHMARK() functions. This technique works even when the application returns no visible output or error messages.

Root Cause

The root cause is insufficient escaping of the orderby parameter combined with the absence of prepared statements in the affected SQL query. The vulnerable code paths exist in api/contactform7.php at lines 113 and 117, and in api/index.php at line 8, as referenced in the WordPress Plugin Code Reference.

Attack Vector

Exploitation requires an authenticated session with administrator-level privileges or higher. The attacker sends a crafted HTTP request to the plugin's API endpoint with a malicious orderby value containing time-delay SQL functions. Response timing differences confirm successful injection and allow byte-by-byte data extraction from tables such as wp_users and wp_usermeta.

No verified public exploit code is available. Refer to the Wordfence advisory for technical details on the injection mechanics.

Detection Methods for CVE-2026-7618

Indicators of Compromise

• HTTP requests to plugin API endpoints containing SQL keywords such as SLEEP, BENCHMARK, IF(, or SELECT in the orderby parameter.
• Web server access logs showing unusually long response times for requests to api/contactform7.php or api/index.php.
• Repeated authenticated requests from a single administrator session iterating over data extraction patterns.

Detection Strategies

• Inspect web access logs for orderby parameter values containing non-alphanumeric characters or SQL syntax tokens.
• Correlate authenticated administrator activity with anomalous query response latencies exceeding baseline by several seconds.
• Enable WordPress query logging or database audit logs to capture queries against the plugin's tables containing time-delay functions.

Monitoring Recommendations

• Monitor administrator account logins for unusual source IPs, geolocations, or login times.
• Alert on web application firewall (WAF) signatures matching SQL injection patterns targeting WordPress plugin endpoints.
• Track plugin file integrity and review changes to api/contactform7.php and api/index.php.

How to Mitigate CVE-2026-7618

Immediate Actions Required

• Update the EnvíaloSimple plugin to a version newer than 2.4.5 once a patched release becomes available.
• Audit all WordPress administrator accounts and revoke unused or stale privileges.
• Enforce strong, unique passwords and multi-factor authentication (MFA) for every administrator account.
• Deploy a web application firewall with SQL injection rules covering WordPress plugin endpoints.

Patch Information

At the time of publication, no fixed version is documented in the NVD entry. Monitor the plugin repository on WordPress.org and the Wordfence Vulnerability Analysis for the release that supersedes version 2.4.5.

Workarounds

• Deactivate and remove the EnvíaloSimple plugin until a patched version is installed.
• Restrict access to /wp-admin/ and the plugin's API endpoints using IP allowlisting at the web server or WAF layer.
• Apply virtual patching rules in a WAF to block orderby parameter values containing SQL syntax such as SLEEP, BENCHMARK, or UNION.
• Review database user permissions and ensure the WordPress database user has the minimum required privileges.

# Example WAF rule (ModSecurity) to block SQL keywords in orderby
SecRule ARGS:orderby "@rx (?i)(sleep|benchmark|union|select|if\()" \
  "id:1026761801,phase:2,deny,status:403,msg:'Possible SQLi in orderby parameter (CVE-2026-7618)'"