CVE-2026-103530 in 9Router
Summary
by MITRE • 10/01/2026
A vulnerability was detected in decolua 9Router up to 0.5.55. The affected element is the function fetch of the file src/shared/utils/ssrfGuard.js of the component Search Endpoint. Performing a manipulation of the argument provider_options.baseUrl results in server-side request forgery. The attack can be initiated remotely. Applying a patch is the recommended action to fix this issue.
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Analysis
by VulDB Data Team • 10/01/2026
The vulnerability identified within decolua 9Router versions up to 0.5.55 represents a critical security flaw located specifically within the Search Endpoint component, which serves as a primary interface for data retrieval operations in the application architecture. The root cause of this insecurity resides in the fetch function contained in the source file src/shared/utils/ssrfGuard.js. This module is ostensibly designed to act as a protective layer against malicious external requests by validating and sanitizing input parameters before they are processed by underlying network libraries. However, the implementation fails to adequately enforce restrictions on the provider_options.baseUrl argument, allowing an attacker to bypass intended security controls through carefully crafted input manipulation.
This specific technical flaw constitutes a Server-Side Request Forgery vulnerability, commonly categorized under CWE-918 in industry-standard classification systems such as those maintained by MITRE. The core issue arises because the application constructs HTTP requests based on user-supplied or externally influenced data without sufficiently verifying that the target URL falls within an allowed list of domains or protocols. By manipulating the provider_options.baseUrl parameter, a remote attacker can instruct the server to initiate connections to arbitrary internal or external resources. This capability effectively turns the vulnerable server into a proxy for malicious activities, enabling the attacker to probe internal network services, access sensitive configuration files, or interact with backend APIs that are not directly exposed to the public internet.
The operational impact of this vulnerability is severe due to its remote exploitability and potential for lateral movement within an organization's infrastructure. An adversary can leverage SSRF to perform port scanning against internal hosts, extract metadata from cloud provider instances such as AWS EC2 or Azure VMs by accessing local endpoint URLs like 169.254.169.254, or conduct attacks against other services running on the same host that may have weaker authentication mechanisms. In many cases, SSRF vulnerabilities serve as a stepping stone for more advanced attack chains, including credential theft and unauthorized data exfiltration. The ability to initiate these requests remotely means that no prior authentication is necessarily required if the Search Endpoint itself does not enforce strict access controls, although even authenticated scenarios pose significant risks given the breadth of potential targets an attacker can reach from within the trusted network perimeter.
From a tactical perspective, this vulnerability aligns with techniques observed in real-world threat actor campaigns as documented in the MITRE ATT&CK framework, specifically under T1571 which covers Non-Standard Ports and potentially T1098 if used to manipulate cloud metadata for credential access. The exploitation of such flaws often occurs during the initial compromise phase or when attackers are attempting to expand their foothold within a network environment. Security teams should recognize that SSRF vulnerabilities in web applications frequently stem from insufficient validation logic where developers assume that internal URLs are safe, failing to account for DNS rebinding attacks or other evasion techniques that can bypass simple domain-based allowlists.
To mitigate this risk and restore the security posture of decolua 9Router systems, it is imperative to apply the official patch released by the vendor immediately. The update addresses the insufficient validation logic within the ssrfGuard.js module, ensuring that all URLs passed through the fetch function are rigorously checked against a strict allowlist or validated using robust protocols such as rejecting private IP ranges and loopback addresses. In addition to applying the software update, organizations should implement network-level controls such as egress filtering on firewalls to restrict outbound connections from application servers to only those destinations strictly required for business operations. This defense-in-depth approach limits the blast radius of any potential SSRF exploitation by preventing the server from reaching sensitive internal resources even if the application-layer validation is bypassed. Regular security assessments and code reviews focusing on input handling in network-related functions are also recommended to prevent similar vulnerabilities from being introduced during future development cycles.