CVE-2026-66608 in Unlimited Elements Plugin
Summary
by MITRE • 09/17/2026
Contributor Server Side Request Forgery (SSRF) in Unlimited Elements For Elementor (Free Widgets, Addons, Templates) <= 2.0.19 versions.
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Analysis
by VulDB Data Team • 09/17/2026
The vulnerability identified as a Server-Side Request Forgery (SSRF) flaw within the Unlimited Elements for Elementor plugin affects all installations running version 2.0.19 and earlier. This WordPress plugin is widely utilized to extend the functionality of the popular page builder, offering users a suite of free widgets, addons, and templates. The core issue stems from insufficient validation of user-supplied input when processing requests that initiate outbound network connections on behalf of the server. An attacker can exploit this weakness by crafting malicious HTTP or HTTPS requests containing specially crafted URLs as parameters. Because the application processes these inputs without adequate sanitization or allow-listing mechanisms, it proceeds to execute the request using the server's own identity and network privileges.
From a technical perspective, the flaw allows an authenticated attacker, typically requiring at least subscriber-level access due to WordPress permissions models, to force the backend PHP environment to connect to internal resources that are otherwise inaccessible from the public internet. This includes local services such as database servers running on localhost, metadata endpoints of cloud infrastructure providers like AWS or Azure which expose sensitive configuration data and temporary credentials, and internal application interfaces within a corporate network segment if the WordPress instance is hosted in an enterprise environment. The attacker manipulates parameters related to image fetching, API integrations, or template loading features where external URLs are accepted as input values.
The operational impact of this SSRF vulnerability extends beyond simple information disclosure. By leveraging the server's elevated privileges and internal network access, attackers can perform port scanning against internal hosts to map out the network topology. They may also attempt to interact with vulnerable internal services that lack proper authentication controls, potentially leading to remote code execution or further compromise of critical infrastructure components such as Redis instances, Elasticsearch clusters, or administrative dashboards for other applications hosted on the same server. In cloud environments, accessing metadata endpoints can result in the theft of IAM role credentials, allowing the attacker to escalate privileges and take control over associated cloud resources effectively bypassing perimeter defenses designed to protect external-facing assets only.
This vulnerability aligns with CWE-918 which defines Server-Side Request Forgery as a class of flaws where an application retrieves data from a remote server using user-supplied input without proper validation. Furthermore, in the context of the MITRE ATT&CK framework for enterprise security, this behavior maps to T1571 which covers Non-Standard Application Layer Protocol usage and potentially T1098 if it leads to account manipulation through credential theft via metadata services. The lack of strict allow-listing for destination hosts or protocols is a common misconfiguration that enables such attacks, highlighting the importance of implementing robust input validation strategies in web applications that perform server-side HTTP requests.
To mitigate this risk, administrators should immediately update the Unlimited Elements plugin to version 2.0.20 or later where these security issues have been addressed by the developers. In cases where immediate patching is not feasible due to compatibility concerns with other site components, temporary mitigations include restricting outbound network traffic from the web server using firewall rules that block access to private IP ranges and cloud metadata endpoints such as 169.254.169.254 for AWS or similar addresses for other providers. Additionally, implementing a Web Application Firewall with specific rule sets designed to detect SSRF patterns in HTTP parameters can provide an additional layer of defense by blocking requests that attempt to access internal resources based on IP address ranges or domain names associated with private networks. Regular security audits and code reviews focusing on functions handling external resource retrieval are essential to prevent similar vulnerabilities from being introduced during future development cycles.