CVE-2026-3163 is a server-side request forgery vulnerability identified in SourceCodester Website Link Extractor version 1.0. The vulnerability arises from improper handling of URLs in the URL Handler component, specifically within the file_get_contents function, which is used to fetch content from specified URLs. An attacker can remotely supply crafted URLs that cause the server to make unintended HTTP requests to internal or external systems. This SSRF flaw does not require authentication or user interaction, increasing its exploitation potential. The vulnerability could allow attackers to access internal services behind firewalls, perform reconnaissance, or potentially exploit other vulnerabilities on internal systems. The CVSS 4.0 score of 5.3 reflects a medium severity, considering the low attack complexity and no required privileges but limited impact on confidentiality, integrity, and availability. No patches or official fixes have been published yet, and no known exploits are currently active in the wild. The vulnerability affects only version 1.0 of the product, which is a specialized tool for extracting website links, likely used in web development or SEO contexts. The lack of authentication requirements and the ability to initiate SSRF remotely make this a notable risk for organizations running this software exposed to untrusted networks.

The primary impact of this SSRF vulnerability is unauthorized internal network access and information disclosure. Attackers can leverage the vulnerable server to send crafted requests to internal services that are otherwise inaccessible externally, potentially exposing sensitive data or enabling lateral movement. This could lead to further exploitation if internal services have additional vulnerabilities. The vulnerability could also be used to perform port scanning or service enumeration within the internal network, aiding attackers in planning more targeted attacks. Although the direct impact on data integrity or availability is limited, the SSRF can serve as a stepping stone for more severe attacks. Organizations using the affected software in internet-facing environments are at higher risk. The medium CVSS score indicates a moderate level of concern, but the absence of authentication and user interaction requirements increases the likelihood of exploitation. The lack of patches means the vulnerability remains exploitable until mitigated by other means.

To mitigate CVE-2026-3163, organizations should first restrict the URLs that the Website Link Extractor processes by implementing strict allowlists or validation of input URLs to prevent requests to internal or sensitive network addresses. Network-level controls such as firewall rules or egress filtering should be applied to limit the server’s ability to make outbound HTTP requests to internal IP ranges or untrusted destinations. If possible, isolate the vulnerable application in a segmented network zone with minimal access to critical internal resources. Monitoring and logging outbound requests from the server can help detect exploitation attempts. Until an official patch is released, consider disabling or replacing the vulnerable component or product version. Additionally, review and harden any internal services that could be targeted via SSRF to reduce the potential impact. Regularly check for vendor updates or security advisories for a patch or official remediation.