CVE-2026-42411: CloudSecure WP Security Auth Bypass Flaw

CVE-2026-42411 Overview

CVE-2026-42411 is a broken authentication vulnerability affecting the CloudSecure WP Security WordPress plugin in versions 1.4.7 and earlier. The flaw allows unauthenticated network-based attackers to bypass authentication controls enforced by the plugin. Successful exploitation impacts the confidentiality, integrity, and availability of affected WordPress installations. The weakness is classified under CWE-288: Authentication Bypass Using an Alternate Path or Channel.

Critical Impact
Unauthenticated attackers can bypass authentication on WordPress sites running CloudSecure WP Security <= 1.4.7, potentially gaining unauthorized access to protected resources and administrative functions.

Affected Products

CloudSecure WP Security WordPress plugin versions <= 1.4.7
WordPress sites relying on CloudSecure WP Security for authentication hardening
Any deployment where the plugin mediates access to protected endpoints

Discovery Timeline

2026-06-15 - CVE-2026-42411 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-42411

Vulnerability Analysis

The vulnerability resides in the authentication logic of the CloudSecure WP Security plugin. An attacker reaching the WordPress site over the network can bypass authentication checks without supplying valid credentials. No user interaction is required, and the attack does not depend on prior privileges on the target system.

The attack complexity is rated as high, indicating that successful exploitation depends on conditions outside the attacker's direct control. Despite this requirement, the impact spans confidentiality, integrity, and availability if the bypass succeeds. The EPSS data places exploitation probability at 0.405% with a percentile of 32.119.

Root Cause

The root cause is an authentication weakness mapped to CWE-288. The plugin exposes a path or channel that does not enforce the same authentication controls applied to standard access flows. Attackers who reach this alternate path can invoke protected functionality as if they were authenticated.

Attack Vector

Exploitation occurs over the network against the WordPress HTTP interface. The attacker sends crafted requests targeting the plugin's authentication-handling code path. Because no privileges or user interaction are required, internet-exposed WordPress installations running the affected plugin versions are reachable directly by unauthenticated adversaries.

Specific exploitation details are documented in the Patchstack Vulnerability Advisory. No public proof-of-concept has been recorded in the enriched data at time of publication.

Detection Methods for CVE-2026-42411

Indicators of Compromise

Unexpected authenticated sessions or administrator actions originating from IP addresses with no prior history of legitimate access.
HTTP requests to CloudSecure WP Security plugin endpoints that return success responses without a corresponding authentication transaction in logs.
New or modified WordPress user accounts, plugin files, or scheduled tasks (wp_cron) created without an associated admin login event.

Detection Strategies

Inventory WordPress installations and identify any using CloudSecure WP Security at version <= 1.4.7.
Review web server access logs for requests to plugin-specific routes that bypass standard wp-login.php or REST authentication flows.
Correlate WordPress audit logs with web server logs to surface privileged actions lacking a preceding authentication event.

Monitoring Recommendations

Forward WordPress, web server, and WAF logs to a centralized analytics platform for cross-source correlation.
Alert on creation or modification of administrator accounts, plugin installations, and theme file edits.
Monitor outbound connections from the web host for indicators of post-exploitation activity such as webshell command-and-control traffic.

How to Mitigate CVE-2026-42411

Immediate Actions Required

Identify WordPress sites running CloudSecure WP Security <= 1.4.7 and prioritize them for remediation.
Update the plugin to a fixed version once the vendor publishes a patched release, as referenced in the Patchstack advisory.
Rotate WordPress administrator credentials and review user accounts for unauthorized additions or role changes.

Patch Information

The Patchstack advisory tracks remediation status for this issue. Apply the fixed version of CloudSecure WP Security as soon as it becomes available from the plugin maintainer. If no patched version is published, treat the plugin as unsafe to run on production sites.

Workarounds

Deactivate and remove the CloudSecure WP Security plugin until a fixed version is available.
Restrict access to the WordPress admin interface and plugin endpoints using IP allow-lists at the web server or WAF.
Deploy virtual patching rules at the WAF to block requests matching the exploit pattern described in the Patchstack advisory.

bash

# Example: deactivate the vulnerable plugin using WP-CLI
wp plugin deactivate cloudsecure-wp-security
wp plugin delete cloudsecure-wp-security

# Example: restrict wp-admin to trusted IPs in nginx
# location ^~ /wp-admin/ {
#     allow 203.0.113.0/24;
#     deny all;
# }