CVE-2026-45441: WpEvently Unauthenticated Vulnerability

CVE-2026-45441 Overview

CVE-2026-45441 affects the WpEvently WordPress plugin (also known as Mage Eventpress) in versions up to and including 5.3.3. The vulnerability allows unauthenticated network-based attacks against WordPress sites running the affected plugin. The flaw is categorized under [CWE-1284] (Improper Validation of Specified Quantity in Input), indicating insufficient validation of input quantities supplied to the plugin. The issue affects data integrity on the target installation without requiring authentication or user interaction. Site operators using the WpEvently plugin should treat this as a high-priority patching item due to the unauthenticated network attack surface.

Critical Impact
Unauthenticated attackers can compromise data integrity on WordPress sites running WpEvently 5.3.3 or earlier over the network without user interaction.

Affected Products

WpEvently WordPress plugin (Mage Eventpress) versions ≤ 5.3.3
WordPress installations with the WpEvently plugin enabled
Any web-accessible WordPress site exposing the vulnerable plugin endpoints

Discovery Timeline

2026-06-15 - CVE-2026-45441 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-45441

Vulnerability Analysis

The vulnerability resides in the WpEvently plugin's input handling logic. According to the Patchstack Vulnerability Report, the plugin fails to properly validate the quantity of input data supplied to one or more of its routines. An attacker can reach the vulnerable code paths over the network without prior authentication and without any victim interaction. Exploitation impacts integrity, meaning that an attacker can modify, alter, or corrupt data managed by the plugin or stored within the WordPress site. Confidentiality and availability are not directly impacted by this issue.

Root Cause

The root cause is improper validation of specified quantity in input, classified as [CWE-1284]. The plugin accepts input without enforcing the expected size, count, or range constraints. This permits malformed or out-of-bound values to pass downstream into operations that mutate plugin or site state. Because the affected endpoints are reachable without authentication, the validation gap becomes directly exploitable from the public internet.

Attack Vector

The attack vector is network-based with low attack complexity. An attacker sends crafted HTTP requests to vulnerable WpEvently endpoints exposed by the WordPress installation. No credentials or user interaction are required. The specific request structure and parameters are detailed in the Patchstack advisory referenced above. Defenders should consult the vendor advisory for the exact endpoint and parameter details required to construct detection and blocking rules.

Detection Methods for CVE-2026-45441

Indicators of Compromise

Unexpected modifications to event data, posts, or plugin-managed records in the WordPress database
Anomalous unauthenticated POST or GET requests to WpEvently plugin endpoints under /wp-content/plugins/mage-eventpress/ or related AJAX actions
New or altered plugin configuration entries in wp_options without a corresponding administrator session

Detection Strategies

Inspect web server access logs for unauthenticated requests targeting WpEvently endpoints with unusual parameter values or oversized payloads
Compare WordPress database records against known-good backups to identify unauthorized integrity changes
Deploy web application firewall (WAF) signatures that match malformed input patterns against the affected plugin paths

Monitoring Recommendations

Enable WordPress audit logging to capture changes to plugin-managed data and configuration
Monitor HTTP request rates and parameter anomalies against mage-eventpress plugin paths
Alert on file integrity changes within the WpEvently plugin directory and on unexpected database row modifications

How to Mitigate CVE-2026-45441

Immediate Actions Required

Inventory all WordPress installations and identify any running WpEvently (Mage Eventpress) version 5.3.3 or earlier
Disable the WpEvently plugin on affected sites until a patched version is installed if a patch is available
Restrict access to WordPress admin and plugin endpoints through IP allowlists or a WAF where business requirements allow

Patch Information

Refer to the Patchstack Vulnerability Report for the latest vendor-supplied fix details. Update WpEvently to a version newer than 5.3.3 as soon as the vendor releases a patched release. Verify the installed version under WordPress Admin → Plugins after applying updates.

Workarounds

Deploy WAF rules to block unauthenticated requests to WpEvently plugin endpoints carrying anomalous or oversized parameters
Temporarily deactivate the WpEvently plugin until a patched release is verified and installed
Apply principle-of-least-privilege controls and restrict outbound network egress from the WordPress host to limit secondary impact

bash

# Configuration example: deactivate WpEvently via WP-CLI until patch is applied
wp plugin deactivate mage-eventpress
wp plugin status mage-eventpress