CVE-2026-78269 in Shared Files Plugin
Summary
by MITRE • 08/24/2026
Contributor Server Side Request Forgery (SSRF) in Shared Files <= 1.7.69 versions.
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Analysis
by VulDB Data Team • 08/24/2026
The vulnerability identified as Contributor Server Side Request Forgery affects the WordPress plugin "Shared Files" prior to version 1.7.69, representing a critical security flaw that allows attackers to manipulate server-side network requests through user-controlled input. This type of attack exploits the application's ability to fetch resources from external URLs or internal services without adequate validation of the destination address. In this specific context, the plugin likely processes file paths or URL parameters provided by users and passes them directly into functions responsible for retrieving content, such as cURL or PHP stream wrappers, without sanitizing the input against malicious targets. This lack of rigorous input validation creates a direct pathway for an attacker to force the server to connect to unintended destinations, effectively turning the vulnerable application into a proxy for internal network reconnaissance or exploitation of other services.
From a technical perspective, this flaw aligns with CWE-918, which defines Server-Side Request Forgery as a vulnerability where a web application fetches a remote resource without validating the user-supplied URL. The operational mechanism typically involves an attacker crafting a request that includes parameters pointing to internal IP addresses or localhost services that are not exposed to the public internet but are accessible from within the server's network environment. By leveraging this capability, an adversary can probe for open ports, identify running services such as databases, message queues, or administrative interfaces on adjacent systems, and potentially exploit known vulnerabilities in those internal services using the privileged context of the web server itself. This bypasses traditional perimeter defenses like firewalls because the traffic originates from a trusted source within the network boundary.
The impact of this vulnerability extends beyond simple information disclosure. If an attacker successfully exploits SSRF to access sensitive internal endpoints, they may retrieve configuration files containing database credentials, API keys, or other secrets stored on local servers. Furthermore, in cloud environments where instance metadata services are accessible via specific IP addresses like 169.254.169.254, this vulnerability can be leveraged to steal temporary security credentials associated with the server's identity. This could lead to a complete compromise of the underlying infrastructure, allowing lateral movement across the network and escalation of privileges beyond what was originally intended by the application design. The risk is particularly acute in shared hosting or multi-tenant environments where one compromised instance can be used to attack neighboring tenants or core infrastructure components.
In terms of threat classification, this vulnerability maps directly to MITRE ATT&CK technique T1571, which covers Non-Standard Ports and Services often targeted during internal network discovery phases of an intrusion kill chain. It also relates to T1498, Network Denial of Service via SSRF if the attacker attempts to flood internal services with requests, although reconnaissance is the more common primary objective. The exploitation requires a certain level of access depending on whether authentication is required by the vulnerable endpoint; however, even unauthenticated SSRF can be devastating when targeting metadata endpoints or unprotected internal APIs that do not require user credentials for initial access.
To mitigate this risk, immediate action should be taken to update the Shared Files plugin to version 1.7.69 or later, where these input validation checks have presumably been implemented by the developers. In scenarios where updating is not immediately feasible, administrators can implement network-level controls such as egress filtering on web servers to restrict outbound connections to only known and necessary destinations. Additionally, deploying a Web Application Firewall with rules specifically designed to detect SSRF patterns in request parameters can provide an additional layer of defense. It is also critical to ensure that internal services are not bound to public interfaces and utilize private IP ranges exclusively, reducing the attack surface available for exploitation even if the application logic remains flawed temporarily.