CVE-2026-59529 Overview
CVE-2026-59529 is an unauthenticated sensitive data exposure vulnerability in the Ebook Store plugin for WordPress, affecting versions 6.19 and earlier. The flaw stems from missing authorization checks [CWE-862], allowing remote attackers to retrieve sensitive information without credentials or user interaction.
An attacker exploits this weakness over the network with low complexity. The vulnerability affects confidentiality but does not impact integrity or availability of the target system.
Critical Impact
Unauthenticated remote attackers can access sensitive data stored or processed by the Ebook Store plugin, potentially exposing customer records, order details, or other protected information managed by the plugin.
Affected Products
- WordPress Ebook Store plugin versions <= 6.19
- WordPress installations with the Ebook Store plugin enabled
- E-commerce sites relying on the plugin for digital ebook distribution
Discovery Timeline
- 2026-07-27 - CVE-2026-59529 published to NVD
- 2026-07-27 - Last updated in NVD database
Technical Details for CVE-2026-59529
Vulnerability Analysis
The vulnerability is classified under [CWE-862] Missing Authorization. The Ebook Store plugin exposes one or more endpoints or functions that return sensitive data without verifying whether the requesting user is authorized to access that data.
Attackers exploit this issue by sending crafted HTTP requests to the vulnerable plugin endpoints. Because authentication is not required, exploitation is straightforward and can be automated at scale against WordPress sites running the plugin.
The scope is limited to information disclosure. The CVSS vector indicates high impact to confidentiality with no direct effect on data integrity or service availability, though exposed data may enable follow-on attacks such as credential stuffing or targeted phishing.
Root Cause
The root cause is the absence of a permission or capability check on plugin functionality that returns sensitive records. WordPress plugins are expected to enforce authorization using functions such as current_user_can() or nonce validation before returning protected data. The Ebook Store plugin fails to apply such checks on the affected code paths through version 6.19.
Attack Vector
Exploitation occurs remotely over HTTP or HTTPS against a WordPress site running the vulnerable plugin. The attacker sends requests to the plugin's exposed endpoints, typically through the WordPress admin-ajax.php handler or REST API routes registered by the plugin. No authentication, session, or user interaction is required.
Details on the specific vulnerable endpoints are documented in the Patchstack Vulnerability Analysis.
Detection Methods for CVE-2026-59529
Indicators of Compromise
- Unusual volumes of anonymous requests to Ebook Store plugin endpoints, including admin-ajax.php actions and plugin-specific REST routes
- HTTP 200 responses returning JSON or serialized data to unauthenticated clients from plugin endpoints
- Access log entries showing repeated enumeration patterns against plugin URLs from single IPs or distributed sources
Detection Strategies
- Inventory WordPress installations and identify sites running the Ebook Store plugin at version 6.19 or earlier
- Review web server access logs for unauthenticated requests targeting plugin endpoints returning non-empty response bodies
- Deploy web application firewall (WAF) rules that flag anonymous access to plugin functions expected to require authentication
Monitoring Recommendations
- Alert on spikes in anonymous traffic to /wp-admin/admin-ajax.php with plugin-specific action parameters
- Monitor outbound egress for data volumes inconsistent with normal plugin usage patterns
- Track WordPress plugin version inventory continuously to identify unpatched instances
How to Mitigate CVE-2026-59529
Immediate Actions Required
- Update the Ebook Store plugin to a version later than 6.19 as soon as a patched release is available
- Restrict access to the WordPress site or the affected plugin endpoints via WAF or IP allowlisting until patching is complete
- Audit recent access logs for evidence of data exposure and notify affected users if sensitive data was retrieved
Patch Information
At the time of publication, refer to the Patchstack Vulnerability Analysis for the current patched version and remediation guidance. Apply the vendor-supplied update through the WordPress plugin management interface.
Workarounds
- Disable the Ebook Store plugin until a patched version is installed if immediate updating is not possible
- Apply virtual patching through a WAF to block unauthenticated requests to the vulnerable plugin endpoints
- Restrict plugin endpoint access to authenticated administrative sessions via server-level access controls where feasible
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
