CVE-2026-77785 in Rank Math SEO Plugin
Summary
by MITRE • 09/02/2026
The Rank Math SEO WordPress plugin before 1.0.277 does not verify that the requesting user is permitted to read the specific post referenced in a request before returning its content and SEO metadata, allowing users with the Author role and above to read the title, body and metadata of other users' non-public posts.
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Analysis
by VulDB Data Team • 09/02/2026
The vulnerability identified in Rank Math SEO versions prior to 1.0.277 represents a critical failure in access control mechanisms within a widely used WordPress plugin designed for search engine optimization. This flaw stems from an insufficient verification process where the application fails to validate whether the authenticated user initiating a request possesses the necessary permissions to view the specific post content and associated metadata being requested. In standard web application security, particularly within Content Management Systems like WordPress, it is imperative that any endpoint returning sensitive data performs strict authorization checks against the current session's privileges relative to the resource identifier provided in the request parameters. The absence of this check allows for a direct object reference type vulnerability where an attacker can manipulate input variables to access resources belonging to other users or those intended to remain private.
From a technical perspective, the core issue lies in the logic governing how post data is retrieved and served via API endpoints or AJAX handlers integrated within the plugin. When a user with at least Author-level privileges interacts with the system, they can construct requests targeting specific Post IDs that do not belong to them. Because the software does not cross-reference these identifiers against the ownership or visibility status of the posts in question, it proceeds to fetch and return the full title, body content, and SEO metadata regardless of whether those posts are marked as private, draft, or otherwise restricted from public view. This behavior effectively bypasses WordPress's native capability checks which would normally restrict access based on post_status and user role hierarchies. The vulnerability is particularly concerning because it affects users who already have elevated privileges within the CMS environment, meaning that an attacker does not need to exploit a separate authentication flaw or gain admin-level access to compromise data integrity and confidentiality.
The operational impact of this information disclosure vulnerability extends beyond simple privacy breaches for individual content creators. Since Rank Math SEO is installed on millions of WordPress sites globally, successful exploitation can lead to the unauthorized exposure of proprietary business strategies, unpublished marketing materials, confidential client communications embedded in drafts, or sensitive personal information contained within private articles. For organizations relying on these platforms for internal documentation or pre-release product announcements, this flaw poses a significant risk to intellectual property protection and regulatory compliance regarding data privacy. Furthermore, because the vulnerability affects users with Author roles and above, it implies that any compromised account at this level can be leveraged by an attacker to harvest substantial amounts of sensitive content from other accounts on the same installation without triggering standard security alerts or requiring privilege escalation techniques.
This incident aligns closely with Common Weakness Enumeration category CWE-284, which describes Improper Access Control, specifically highlighting failures in verifying user permissions before granting access to resources. Additionally, it maps to MITRE ATT&CK technique T1078, Valid Accounts, as the exploitation relies on legitimate credentials held by users with authorized roles within the system rather than exploiting a software bug that allows unauthenticated access. The attack vector is classified under Insecure Direct Object References (IDOR), where the application exposes internal implementation objects such as database keys or post identifiers to end-users without adequate safeguards against unauthorized manipulation.
To mitigate this vulnerability, administrators must immediately update the Rank Math SEO plugin to version 1.0.277 or later, which includes patches for these authorization checks. Until an upgrade is feasible, site owners should consider restricting access to WordPress admin areas through IP whitelisting if possible and ensuring that all user accounts adhere strictly to the principle of least privilege by downgrading unnecessary Author-level permissions where only lower-tier roles are required for content contribution. Regular security audits and penetration testing focused on authorization logic can help identify similar flaws in custom code or other plugins, reinforcing the overall security posture of the web application infrastructure against data exfiltration attempts.