CVE-2026-62113 Overview
CVE-2026-62113 is an Insecure Direct Object Reference (IDOR) vulnerability in the Slim SEO plugin for WordPress, affecting versions up to and including 4.10.0. The flaw allows authenticated users with Contributor-level privileges to access or reference objects belonging to other users by manipulating identifier parameters. The issue is tracked under CWE-639: Authorization Bypass Through User-Controlled Key.
The vulnerability requires low-privilege authentication and can be exploited over the network without user interaction. Impact is limited to unauthorized disclosure of information handled by the plugin, with no direct impact on integrity or availability.
Critical Impact
Authenticated Contributors can bypass authorization checks in Slim SEO to read plugin-managed data associated with other users' content.
Affected Products
- Slim SEO WordPress plugin versions <= 4.10.0
- WordPress sites permitting Contributor-level accounts
- Multi-author WordPress environments using Slim SEO for metadata management
Discovery Timeline
- 2026-09-11 - CVE-2026-62113 published to the National Vulnerability Database
- 2026-09-11 - Last updated in NVD database
Technical Details for CVE-2026-62113
Vulnerability Analysis
Slim SEO exposes functionality that accepts user-supplied identifiers referencing internal objects such as posts, metadata records, or SEO configuration entries. The plugin fails to verify that the authenticated Contributor is authorized to act on the referenced object before returning or processing the associated data.
Because Contributors can already author draft content in WordPress, the additional ability to reference arbitrary object IDs enables horizontal information disclosure across authors. The CWE-639 classification confirms the root issue lies in authorization decisions being made based on client-supplied keys rather than server-side ownership checks.
The Patchstack advisory documents the affected version range and confirms the issue is remediated in releases after 4.10.0. See the Patchstack Vulnerability Report for advisory details.
Root Cause
The plugin trusts object identifiers submitted through authenticated requests without validating that the current user owns or has capability to access the target object. Missing capability checks such as current_user_can( 'edit_post', $post_id ) allow a Contributor to substitute another author's identifier and receive the corresponding data.
Attack Vector
An attacker first obtains or registers a Contributor account on a target WordPress site running Slim SEO <= 4.10.0. The attacker then submits requests to the vulnerable plugin endpoint while substituting object identifiers to enumerate or retrieve data belonging to other users. No user interaction or elevated privileges are required beyond the initial authenticated session.
Refer to the Patchstack advisory for endpoint-specific technical details.
Detection Methods for CVE-2026-62113
Indicators of Compromise
- Contributor accounts issuing repeated requests to Slim SEO admin-ajax or REST endpoints with sequentially varied numeric identifiers
- Access log entries showing Contributors retrieving SEO metadata associated with posts they did not author
- Unexpected read activity against plugin endpoints outside of normal editorial workflows
Detection Strategies
- Review WordPress access logs for parameter tampering patterns targeting Slim SEO routes
- Enable WordPress audit logging to correlate Contributor account activity with object identifiers accessed
- Deploy a Web Application Firewall rule to flag high-volume ID enumeration against /wp-admin/admin-ajax.php and Slim SEO REST namespaces
Monitoring Recommendations
- Monitor for anomalous Contributor account creation, particularly on sites with open user registration
- Track plugin version inventory to identify WordPress installations still running Slim SEO <= 4.10.0
- Alert on privilege-scoped users generating unusually high request volumes against SEO plugin endpoints
How to Mitigate CVE-2026-62113
Immediate Actions Required
- Update Slim SEO to the latest patched release beyond version 4.10.0 on all affected WordPress installations
- Audit existing Contributor accounts and remove any that are inactive, unrecognized, or unnecessary
- Review recent Slim SEO endpoint activity for signs of ID enumeration by low-privilege users
Patch Information
Upgrade the Slim SEO plugin to a version later than 4.10.0 as published by the vendor. Consult the Patchstack Vulnerability Report for the fixed version reference and confirm the update through the WordPress plugin management console.
Workarounds
- Disable the Slim SEO plugin until the patched version can be deployed if immediate upgrade is not feasible
- Restrict Contributor role assignments and disable open user registration where not required
- Deploy WAF rules that inspect Slim SEO requests for object identifiers not owned by the authenticated user
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.