CVE-2026-4623 in Jeson-Customer-Relationship-Management-System
Summary
by MITRE • 03/24/2026
A security vulnerability has been detected in DefaultFuction Jeson-Customer-Relationship-Management-System up to 1b4679c4d06b90d31dd521c2b000bfdec5a36e00. This affects an unknown function of the file /api/System.php of the component API Module. The manipulation of the argument url leads to server-side request forgery. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used. Continious delivery with rolling releases is used by this product. Therefore, no version details of affected nor updated releases are available. The identifier of the patch is f76e7123fe093b8675f88ec8f71725b0dd186310/98bd4eb07fa19d4f2c5228de6395580013c97476. It is suggested to install a patch to address this issue.
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Analysis
by VulDB Data Team • 03/28/2026
This vulnerability exists within the DefaultFuction Jeson-Customer-Relationship-Management-System where a server-side request forgery flaw has been identified in the API module component. The specific weakness occurs in the /api/System.php file at an unknown function that processes the url argument, creating a pathway for malicious actors to manipulate external requests through the application's backend services. The vulnerability's classification aligns with CWE-918, which specifically addresses server-side request forgery vulnerabilities that enable attackers to make arbitrary requests from the server. This type of flaw represents a critical security weakness in web applications where user-supplied input is not properly validated or sanitized before being used to construct HTTP requests to external systems.
The attack vector for this vulnerability is remote, meaning that an attacker can exploit it without requiring physical access to the target system or any local privileges. The public disclosure of the exploit increases the risk profile significantly as it provides threat actors with readily available tools and techniques to leverage this weakness. The vulnerability's impact extends beyond simple data exfiltration as it can potentially enable attackers to access internal network resources that would normally be protected by firewalls or network segmentation. This represents a fundamental breakdown in the application's security controls, allowing unauthorized access to backend services and potentially leading to further compromise of the system. The continuous delivery model with rolling releases used by this product creates additional complexity in tracking and applying patches, as the lack of version details makes it difficult to determine exactly which installations are vulnerable.
The exploitation of this vulnerability can lead to severe operational consequences including unauthorized access to internal systems, data breaches, and potential lateral movement within the network infrastructure. Attackers could leverage the SSRF vulnerability to access internal services that are not directly exposed to the internet, potentially compromising sensitive data or systems that should remain isolated. The patch identifier provided suggests that the developers have released a fix, but the rolling release model and absence of specific version information complicates the implementation of proper remediation. Organizations should immediately assess their deployment environments to identify systems running vulnerable versions of this CRM system and apply the appropriate patch as indicated by the provided identifiers. The lack of specific version information in the vulnerability description makes it particularly challenging to determine which installations require patching, emphasizing the importance of maintaining detailed inventory records and deployment tracking systems. This vulnerability demonstrates the critical importance of input validation and the principle of least privilege in web application security, as proper sanitization of user input and limiting the scope of external requests could prevent exploitation of this type of vulnerability.
The technical flaw represents a classic case of insufficient input validation where the url parameter is directly used to construct HTTP requests without proper sanitization or validation of the target destination. This creates a dangerous situation where an attacker can manipulate the parameter to target internal systems or services that the application should not be able to access. The vulnerability's classification under the ATT&CK framework would likely map to T1190 - Proxying and T1071.004 - Application Layer Protocol: DNS, as the attack could involve using the compromised system as a proxy to access other network resources. Organizations should implement network segmentation and monitoring to detect unusual outbound requests that might indicate exploitation of this vulnerability, while also ensuring that all applications properly validate and sanitize external input parameters to prevent similar issues from occurring in the future.