CVE-2026-62140 Overview
CVE-2026-62140 is an unauthenticated Insecure Direct Object Reference (IDOR) vulnerability affecting the Quiz And Survey Master plugin for WordPress in versions up to and including 11.2.5. The flaw allows remote attackers to reference internal objects directly through predictable identifiers without proper authorization checks. Successful exploitation exposes information belonging to other users of the plugin. The issue is tracked under CWE-639: Authorization Bypass Through User-Controlled Key and requires no authentication or user interaction to exploit.
Critical Impact
Unauthenticated network-based attackers can access quiz and survey data belonging to other users by manipulating object identifiers in requests.
Affected Products
- WordPress Quiz And Survey Master plugin (quiz-master-next)
- All versions up to and including 11.2.5
- WordPress sites using vulnerable versions of the plugin
Discovery Timeline
- 2026-09-11 - CVE-2026-62140 published to NVD
- 2026-09-11 - Last updated in NVD database
Technical Details for CVE-2026-62140
Vulnerability Analysis
The vulnerability resides in the Quiz And Survey Master plugin's handling of object references. The plugin exposes endpoints that accept user-supplied identifiers to retrieve or manipulate quiz and survey objects. Those endpoints do not enforce ownership or authorization checks before returning the requested resource. An unauthenticated attacker can substitute identifiers in requests to access records belonging to other users.
The scope is limited to confidentiality; the vulnerability does not permit modification of data or disruption of service. Exploitation requires only network access to the WordPress site hosting the plugin.
Root Cause
The root cause is missing authorization enforcement on object retrieval paths, classified as CWE-639. The plugin trusts user-controlled keys (such as quiz IDs or response IDs) to identify the target resource without validating that the caller is entitled to access it. This design pattern allows any request containing a valid identifier to succeed regardless of the requester's identity.
Attack Vector
An attacker interacts with a vulnerable WordPress endpoint exposed by the plugin over HTTP or HTTPS. By enumerating or guessing numeric object identifiers, the attacker submits requests referencing objects owned by other users. The server returns the referenced data because no ownership check is performed. No credentials, plugin configuration changes, or victim interaction are required.
The vulnerability manifests in plugin request handlers that accept object identifiers as parameters. See the Patchstack Vulnerability Report for technical details.
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Stop Identity AttacksDetection Methods for CVE-2026-62140
Indicators of Compromise
- Repeated requests to Quiz And Survey Master plugin endpoints with sequentially incrementing numeric identifiers from a single source address.
- Unusual volumes of successful HTTP 200 responses to plugin endpoints from unauthenticated sessions.
- Access log entries showing enumeration patterns against quiz-master-next plugin paths under /wp-admin/admin-ajax.php or plugin-specific REST routes.
Detection Strategies
- Inspect WordPress access logs for high-frequency requests to Quiz And Survey Master endpoints with varying id, quiz_id, or response_id parameter values.
- Deploy web application firewall rules that flag anomalous parameter enumeration against WordPress plugin endpoints.
- Correlate unauthenticated requests returning quiz or survey response data with source IP reputation and geolocation.
Monitoring Recommendations
- Enable verbose WordPress and web server request logging, retaining query parameters and response sizes for plugin endpoints.
- Monitor plugin inventories for installations of Quiz And Survey Master at version 11.2.5 or earlier across managed WordPress environments.
- Alert on outbound data volumes from WordPress hosts that exceed baseline for plugin-driven endpoints.
How to Mitigate CVE-2026-62140
Immediate Actions Required
- Inventory all WordPress sites and identify installations of the Quiz And Survey Master plugin at version 11.2.5 or earlier.
- Update the plugin to a fixed release as published by the maintainer; consult the Patchstack Vulnerability Report for the fixed version.
- Restrict access to WordPress administrative and AJAX endpoints from untrusted networks where operationally feasible.
Patch Information
The vendor advisory is tracked by Patchstack. Refer to the Patchstack Vulnerability Report for the fixed version and remediation guidance. Apply the update through the WordPress plugin management interface or via automated update workflows.
Workarounds
- Disable the Quiz And Survey Master plugin until a patched version can be deployed if quiz functionality is not business-critical.
- Apply web application firewall rules that restrict unauthenticated access to plugin endpoints handling object identifiers.
- Limit plugin endpoint access to authenticated sessions using server-level access controls where the plugin's functionality permits.
# Example: disable the plugin via WP-CLI pending patch deployment
wp plugin deactivate quiz-master-next
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
