CVE-2026-18050: Events Manager Information Disclosure Flaw

CVE-2026-18050 Overview

CVE-2026-18050 affects the Events Manager WordPress plugin in versions prior to 7.4. The plugin exposes a REST route that serves temporarily stored file uploads without performing any authorization check. Unauthenticated users can retrieve another user's in-progress upload if they know the temporary identifier assigned to that upload.

The identifier is high-entropy and disclosed only to the original uploader. The temporary file is removed on form submission or by a scheduled cleanup task. As a result, cross-user reads are not achievable through guessing alone, which limits practical exploitation.

Critical Impact
Unauthenticated retrieval of in-progress file uploads is possible when the temporary identifier is known, exposing potentially sensitive content submitted through Events Manager forms.

Affected Products

Events Manager WordPress plugin versions before 7.4
WordPress sites using Events Manager with file upload features
Public-facing event registration workflows relying on temporary upload storage

Discovery Timeline

2026-08-06 - CVE-2026-18050 published to NVD
2026-08-06 - Last updated in NVD database

Technical Details for CVE-2026-18050

Vulnerability Analysis

The Events Manager plugin implements a REST route that returns the contents of temporary file uploads submitted through event forms. The route lacks authorization checks and does not verify that the requester is the original uploader or an authenticated user with appropriate capability.

Any client that presents a valid temporary identifier receives the associated file. This constitutes broken access control on a REST endpoint that should be scoped to the uploading session or authenticated user context. The vulnerability is classified as a missing authorization issue on an API route.

Exploitation risk is bounded by the identifier's entropy. The token is generated with sufficient randomness to resist brute-force enumeration, and the file is deleted after submission or by scheduled cleanup. An attacker must obtain the identifier through side channels such as logs, referrer leakage, or shared devices.

Root Cause

The REST route responsible for serving temporary uploads does not enforce a permission callback tied to the uploader's session. WordPress REST API endpoints require an explicit permission_callback to gate access. In vulnerable versions, this callback returns permissive results instead of validating ownership of the temporary upload identifier.

Attack Vector

An attacker who obtains a temporary upload identifier through observation, log exposure, or referrer disclosure sends an unauthenticated HTTP GET request to the REST route. The server returns the file contents without verifying the requester's identity. See the WPScan Vulnerability Advisory for endpoint specifics.

Detection Methods for CVE-2026-18050

Indicators of Compromise

Unauthenticated requests to Events Manager REST routes serving temporary uploads from unfamiliar IP addresses.
Access log entries showing successful 200 responses to the temporary upload REST route without a preceding authenticated session.
Repeated requests to the same temporary upload identifier from multiple source IPs within a short window.

Detection Strategies

Review WordPress access logs for requests to /wp-json/ paths associated with the Events Manager plugin that return file content to unauthenticated clients.
Correlate temporary identifier values across referrer headers, error logs, and outbound traffic to detect identifier leakage.
Alert on any REST route response containing binary or document MIME types served without an authenticated cookie or nonce.

Monitoring Recommendations

Enable verbose logging on the WordPress REST API and forward events to a centralized log platform for correlation.
Monitor for anomalous read volume against Events Manager endpoints, particularly outside typical event registration windows.
Track plugin version inventory across WordPress sites to identify hosts still running Events Manager below version 7.4.

How to Mitigate CVE-2026-18050

Immediate Actions Required

Upgrade the Events Manager plugin to version 7.4 or later on all WordPress installations.
Audit web server and application logs for prior exposure of temporary upload identifiers through referrers, error output, or third-party integrations.
Rotate or invalidate any pending event registrations that involved sensitive file uploads before the patch was applied.

Patch Information

The vendor addressed the issue in Events Manager version 7.4 by adding an authorization check to the affected REST route. Refer to the WPScan Vulnerability Advisory for the fixed version and change details.

Workarounds

Disable the Events Manager plugin until it can be upgraded if event file uploads are not actively required.
Restrict access to /wp-json/ REST routes at the web server or WAF layer for unauthenticated clients where feasible.
Configure the web server to strip Referer headers on outbound links from upload confirmation pages to reduce identifier leakage.

bash

# Update Events Manager plugin via WP-CLI
wp plugin update events-manager --version=7.4
wp plugin list --name=events-manager --fields=name,status,version