CVE-2026-16979 in SmartCrawl Plugin
Summary
by MITRE • 08/19/2026
The SmartCrawl SEO checker, analyzer & optimizer WordPress plugin before 3.16.3 does not perform capability checks on two of its AJAX actions, allowing users with at least the Subscriber role to read the titles of private and draft posts by ID and to enumerate stored post-meta key names.
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Analysis
by VulDB Data Team • 08/20/2026
The vulnerability identified in SmartCrawl SEO checker, analyzer & optimizer versions prior to 3.16.3 represents a critical failure in access control mechanisms within WordPress plugin development. This flaw stems from the absence of proper capability verification on two specific AJAX endpoints exposed by the plugin. In the context of Content Management Systems like WordPress, security relies heavily on role-based access control where actions are restricted based on user privileges. The developers failed to implement checks ensuring that only users with elevated permissions could execute these particular functions, thereby allowing any authenticated user, even those with the most basic Subscriber role, to interact directly with sensitive backend processes via AJAX requests.
The technical nature of this flaw involves two distinct information disclosure vectors enabled by the lack of authorization checks. First, an attacker can query specific post identifiers to retrieve the titles of posts that are marked as private or remain in draft status. Normally, such content is hidden from public view and restricted to administrators or authors with appropriate editing rights. By exploiting the unauthenticated AJAX action, a malicious actor can systematically iterate through potential post IDs to harvest these titles without needing any special privileges beyond a standard login account on the site. Second, the vulnerability allows for the enumeration of stored post-meta key names. Post metadata is often used by plugins and themes to store configuration data or custom fields that may contain sensitive information about how the website operates or what third-party services are integrated with it.
The operational impact of this vulnerability extends beyond simple curiosity-driven reconnaissance. The ability to read private and draft post titles can provide attackers with valuable intelligence regarding upcoming content, internal communications, or unpublished strategies before they are made public. This level of visibility into editorial workflows can be leveraged for social engineering attacks or targeted phishing campaigns against site administrators who may inadvertently reveal sensitive details in these drafts. Furthermore, the enumeration of post-meta keys serves as a precursor to more severe exploitation attempts. By mapping out which metadata fields exist on specific posts, an attacker gains insight into the plugin's internal data structure and potentially identifies other vectors for further attacks, such as injection or manipulation if those meta values are later processed insecurely elsewhere in the application logic.
This vulnerability aligns with CWE-284 Improper Access Control, specifically highlighting a failure to enforce proper restrictions on unauthenticated users within an authenticated context. It also maps closely to MITRE ATT&CK technique T1087 Account Discovery, as it allows for the enumeration of user-accessible resources and data structures that should be restricted. The exploitation does not require complex payloads or binary exploits but relies instead on standard HTTP requests crafted to trigger the vulnerable AJAX endpoints with valid authentication cookies from a low-privilege account.
Mitigation strategies primarily involve upgrading the SmartCrawl plugin to version 3.16.3 or later, where these access control checks have been properly implemented by the developers. For organizations unable to upgrade immediately due to compatibility constraints, temporary workarounds include restricting user registration on WordPress sites if not strictly necessary and employing Web Application Firewalls configured to detect anomalous AJAX request patterns targeting known vulnerable endpoints. Additionally, regular security audits of custom plugins should enforce strict adherence to capability verification standards before exposing any functionality through public-facing interfaces like AJAX handlers.