CVE-2026-89000 in WPeMatico RSS Feed Fetcher Plugin
Summary
by MITRE • 09/27/2026
The WPeMatico RSS Feed Fetcher WordPress plugin before 2.8.27 does not perform a capability check or validate the destination of a user-supplied feed URL before fetching it server-side, allowing users with contributor-level access and above to make the server issue requests to internal-only resources and read the responses back.
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Analysis
by VulDB Data Team • 09/27/2026
The vulnerability identified in WPeMatico RSS Feed Fetcher versions prior to 2.8.27 represents a critical Server-Side Request Forgery (SSRF) flaw rooted in insufficient input validation and access control mechanisms. This issue specifically affects WordPress sites utilizing the plugin for automated content aggregation via RSS feeds. The core technical deficiency lies in the application's failure to enforce capability checks or validate the destination of user-supplied feed URLs before initiating server-side HTTP requests. Consequently, any authenticated user with contributor-level permissions or higher can manipulate the input parameters to direct the web server toward internal network resources that are typically inaccessible from external networks. This lack of sanitization allows attackers to bypass standard perimeter defenses by leveraging the trusted status of the application server itself.
From a technical perspective, this vulnerability exploits the trust relationship between the WordPress backend and its own infrastructure. When a user submits an RSS feed URL, the plugin processes it without verifying whether the target is within an allowed whitelist or checking if the requesting user has administrative privileges required for such sensitive operations. By supplying URLs pointing to internal IP addresses, localhost endpoints, or cloud metadata services, an attacker can force the server to communicate with these restricted destinations. The application then fetches the content and often returns it to the user interface, effectively creating a read-only proxy that exposes internal network data to authenticated users who should not have such access capabilities.
The operational impact of this vulnerability is significant, particularly in environments where sensitive internal services are hosted on the same server or within the same private subnet as the WordPress installation. Attackers can use this flaw to enumerate internal network topology by probing various ports and IP addresses based on response times or error messages. More critically, they can access internal APIs, database management interfaces, or configuration files that contain credentials and sensitive business logic. In cloud environments, this vulnerability poses an even greater risk as it may allow attackers to retrieve instance metadata tokens, which could lead to full compromise of the underlying virtual machine if combined with other exploitation techniques. This aligns closely with CWE-918, which describes Server-Side Request Forgery flaws where a web server makes requests on behalf of users without proper validation.
Furthermore, this vulnerability maps directly to MITRE ATT&CK technique T1557, specifically Adversary-in-the-Middle or Lateral Tool Transfer scenarios involving SSRF for network reconnaissance and data exfiltration within the internal infrastructure. The ability to read responses back from internal resources transforms a simple input validation error into a powerful tool for lateral movement and information gathering. Security teams must recognize that even low-privilege accounts, such as contributors in WordPress ecosystems, can become vectors for high-severity attacks if application logic fails to enforce strict separation of duties and network boundary controls.
To mitigate this vulnerability, organizations should immediately update the WPeMatico plugin to version 2.8.27 or later, where these security checks have been implemented. In cases where updating is not immediately feasible, administrators can implement a web application firewall rule set that blocks outbound requests from the WordPress directory to private IP ranges such as 10.x.x.x, 192.168.x.x, and 172.16.x.x through 172.31.x.x. Additionally, restricting file permissions and ensuring that only administrators can modify plugin settings or add new feed sources adds a layer of defense in depth. Regular security audits focusing on input validation and access control lists are essential to prevent similar SSRF vulnerabilities from being introduced into other parts of the application stack.