CVE-2026-12906 in RTMKit Plugin
Summary
by MITRE • 07/16/2026
The RTMKit WordPress plugin before 2.0.9 does not perform a capability check in one of its AJAX actions and resolves a request-supplied post identifier directly, allowing users with at least the Contributor role to read the titles of other users' private, draft, pending, scheduled and trashed posts.
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Analysis
by VulDB Data Team • 07/16/2026
The RTMKit WordPress plugin vulnerability represents a critical access control flaw that undermines the core security model of the WordPress platform. This issue affects versions prior to 2.0.9 and demonstrates a classic privilege escalation weakness where unauthorized users can bypass normal permission checks. The vulnerability specifically targets the plugin's AJAX handling mechanism, which is commonly used for asynchronous communication between the frontend and backend without requiring full page reloads. The flaw exists in how the plugin processes user requests through its AJAX interface, creating an opportunity for malicious actors to exploit the system's trust model.
The technical implementation of this vulnerability stems from the absence of proper capability verification within the affected AJAX action. WordPress employs a robust permission system where different user roles are granted specific capabilities that determine what actions they can perform on content. Contributors typically have limited permissions including the ability to create and edit their own posts, but should not be able to access other users' private content. The plugin fails to validate whether the requesting user possesses sufficient privileges to access the target post, instead relying solely on a post identifier provided in the request parameters. This direct parameter handling approach creates a path traversal vulnerability where any authenticated user can manipulate the system to retrieve information about posts they should not normally be able to access.
The operational impact of this vulnerability extends beyond simple information disclosure, as it allows attackers to discover the existence and titles of various types of posts that are typically restricted from public view. Private posts, draft entries, pending revisions, scheduled publications, and trashed content all become accessible through this flaw, providing attackers with valuable intelligence about a website's content management practices and potentially revealing sensitive information about upcoming releases or internal operations. The vulnerability affects the confidentiality aspect of the CIA triad by enabling unauthorized data access that could be used for social engineering attacks, competitive intelligence gathering, or planning more sophisticated exploitation attempts.
This vulnerability aligns with CWE-285, which addresses improper authorization issues in software systems, and demonstrates how insufficient input validation can lead to privilege escalation. The ATT&CK framework categorizes this as a privilege escalation technique through access control bypass, where an attacker leverages a weakness in the system's permission model to gain elevated access capabilities. The impact is particularly concerning for WordPress sites that host sensitive information or operate in environments where content confidentiality is paramount. Organizations using RTMKit plugin versions before 2.0.9 should immediately implement patch management procedures to upgrade to the secure version, while also reviewing their overall security posture and ensuring all plugins maintain proper capability checks.
Mitigation strategies should include immediate patch deployment as the primary defense mechanism, along with implementing additional monitoring for suspicious AJAX requests that might indicate exploitation attempts. Security teams should also establish automated scanning procedures to identify similar vulnerabilities across other custom plugins or themes within their WordPress installations. The vulnerability highlights the importance of following secure coding practices such as implementing proper input validation, performing capability checks before processing user requests, and avoiding direct parameter handling without sufficient authorization verification. Organizations should conduct regular security audits of third-party plugins and maintain up-to-date security policies that address the risks associated with authenticated privilege escalation vulnerabilities in content management systems.