CVE-2026-42660 Overview
CVE-2026-42660 is a sensitive data exposure vulnerability affecting the Contest Gallery WordPress plugin in versions up to and including 28.1.7. The flaw allows authenticated users holding the low-privileged Subscriber role to access information they should not be able to read. The issue is categorized under [CWE-497]: Exposure of Sensitive System Information to an Unauthorized Control Sphere.
The vulnerability is exploitable over the network and requires only low-level authentication. Successful exploitation impacts confidentiality without affecting integrity or availability. Site operators running Contest Gallery should treat patching as a priority on multi-author or membership sites where untrusted users can register.
Critical Impact
Authenticated Subscriber-level users can retrieve sensitive data managed by the Contest Gallery plugin, breaking the confidentiality boundary expected for low-privileged WordPress roles.
Affected Products
- Contest Gallery WordPress plugin versions <= 28.1.7
- WordPress sites permitting Subscriber-level registration with Contest Gallery installed
- Any deployment of Contest Gallery prior to the vendor-released fix
Discovery Timeline
- 2026-06-15 - CVE-2026-42660 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2026-42660
Vulnerability Analysis
The Contest Gallery plugin exposes sensitive data to users authenticated with the WordPress Subscriber role. Subscriber is the lowest-privilege built-in WordPress role and is typically granted to self-registered users on community or membership sites. The plugin fails to enforce sufficient authorization checks before returning data tied to contest entries or plugin configuration.
Because authentication is required, the attack cannot be performed anonymously. However, on sites that allow open registration, an attacker can satisfy this prerequisite trivially by creating an account. The data accessible through this flaw falls outside the scope of what Subscribers should read under the WordPress capability model.
The issue is consistent with [CWE-497], where an application returns information about its internal state or other users to a control sphere that should not have access. No integrity or availability impact is reported, narrowing the consequence to disclosure.
Root Cause
The root cause is missing or insufficient capability validation in plugin endpoints that return contest-related data. Endpoints accessible to authenticated users do not verify that the caller holds an appropriate role or capability before returning records. This breaks the principle of least privilege.
Attack Vector
An attacker registers or obtains a Subscriber account on a WordPress site running a vulnerable Contest Gallery version. The attacker then invokes the affected plugin endpoint over HTTP or HTTPS while authenticated. The server returns data that should be restricted to administrators or higher-privileged roles.
No user interaction beyond the attacker's own session is required. The exploit relies entirely on issuing crafted requests to plugin-exposed routes. See the Patchstack WordPress Vulnerability Report for the vendor-coordinated disclosure record.
Detection Methods for CVE-2026-42660
Indicators of Compromise
- Unexpected HTTP requests from Subscriber-role accounts to Contest Gallery AJAX or REST endpoints under /wp-admin/admin-ajax.php or /wp-json/.
- Newly registered Subscriber accounts followed by elevated read activity against plugin endpoints.
- Spikes in outbound data volume tied to authenticated low-privilege sessions.
Detection Strategies
- Review WordPress access logs for authenticated requests to Contest Gallery endpoints originating from non-administrative users.
- Correlate user role with the sensitivity of API responses by inspecting application-layer telemetry.
- Hunt for repeated enumeration patterns from a single authenticated session targeting plugin-specific query parameters.
Monitoring Recommendations
- Enable verbose logging on WordPress and the web server to capture full request URIs and authenticated user IDs.
- Alert on Subscriber-role accounts issuing more than a baseline threshold of plugin AJAX or REST calls per hour.
- Track newly created Subscriber accounts on sites with open registration and correlate with subsequent plugin endpoint activity.
How to Mitigate CVE-2026-42660
Immediate Actions Required
- Update the Contest Gallery plugin to a version higher than 28.1.7 as soon as the vendor releases a patched build.
- Audit existing Subscriber accounts and remove any that are unrecognized or inactive.
- Disable open user registration on sites that do not require it by unchecking Anyone can register in WordPress general settings.
Patch Information
Refer to the Patchstack WordPress Vulnerability Report for the current patch status and fixed version information from the Contest Gallery vendor.
Workarounds
- Deactivate the Contest Gallery plugin until a fixed version is installed if the plugin is not business-critical.
- Restrict access to Contest Gallery endpoints through a web application firewall rule that blocks Subscriber-role sessions from the affected routes.
- Temporarily change the WordPress default registration role away from Subscriber, or disable self-registration entirely.
# Configuration example: disable open registration via WP-CLI
wp option update users_can_register 0
wp option update default_role administrator --skip-plugins --skip-themes # verify current default, then keep at subscriber only if registration is disabled
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
