CVE-2026-107310 in Freelinking
Summary
by MITRE • 10/30/2026
Server-Side Request Forgery (SSRF) vulnerability in Drupal Freelinking allows Server Side Request Forgery. This issue affects Freelinking versions: from 0.0.0 to 4.0.3.
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Analysis
by VulDB Data Team • 10/30/2026
The identified security flaw resides within the Drupal Freelinking module, specifically affecting version ranges from 0.0.0 through 4.0.3. Server-Side Request Forgery represents a critical class of vulnerabilities where an attacker tricks a server into making HTTP requests to arbitrary destinations on behalf of the user or system itself. In this specific context, the vulnerability stems from insufficient validation and sanitization of input parameters that are processed by the Freelinking module when generating links or processing external references. Because Drupal modules often operate with elevated privileges relative to standard end-user inputs, an attacker can exploit this lack of restriction to force the web server to initiate connections to internal network resources, cloud metadata services, or other sensitive backend systems that would otherwise be inaccessible from the public internet.
The technical mechanism behind this exploitation involves manipulating URL parameters or link text fields within Drupal content entities. When a user submits data containing maliciously crafted URLs, the Freelinking module processes these inputs without adequately verifying whether the target host is internal, local, or part of a restricted network segment. This oversight allows an attacker to construct requests that direct the server toward localhost interfaces, private IP ranges such as 10.x.x.x or 192.168.x.x, and cloud provider metadata endpoints like those found at AWS EC2 instance metadata service URLs. By leveraging these internal routes, the vulnerability enables unauthorized access to sensitive configuration data, authentication tokens, and internal application logic that is not intended for public exposure.
The operational impact of this SSRF vulnerability can be severe depending on the deployment environment. In cloud-native architectures, attackers frequently utilize SSRF to query instance metadata services, which often contain temporary security credentials, IAM roles, and other sensitive configuration details necessary for authentication with other AWS or Azure services. Compromise of these credentials can lead to full account takeover within the cloud provider's ecosystem. Furthermore, in on-premises deployments, this vulnerability allows attackers to probe internal network topologies, identify active services running on non-standard ports, and potentially pivot into deeper layers of the corporate infrastructure. This effectively bypasses perimeter firewalls since the requests originate from a trusted server IP address rather than an external source.
This vulnerability aligns with CWE-918, which defines Server-Side Request Forgery as a weakness where web applications retrieve data from URLs provided by users without proper validation. Additionally, it maps to MITRE ATT&CK technique T1557, specifically Adversary-in-the-Middle or Lateral Tool Transfer scenarios where SSRF is used to facilitate further attacks such as credential harvesting or internal network reconnaissance. The exploitation path typically involves crafting specific HTTP requests that target the vulnerable endpoints of the Freelinking module while embedding malicious URLs designed to reach internal targets.
Mitigation strategies must prioritize immediate remediation through software updates and architectural controls. The most effective solution is to upgrade the Drupal Freelinking module to a version greater than 4.0.3, where developers have implemented stricter input validation and URL filtering mechanisms. For environments unable to patch immediately due to compatibility constraints, administrators should implement network-level controls such as egress firewalls that restrict outbound connections from web servers to only known external domains and block access to private IP ranges and cloud metadata endpoints. Additionally, deploying a Web Application Firewall with rules specifically tuned to detect SSRF patterns can provide an additional layer of defense by inspecting outgoing request headers and destinations for anomalies indicative of exploitation attempts.