CVE-2026-4623 identifies a server-side request forgery (SSRF) vulnerability in the DefaultFuction Jeson-Customer-Relationship-Management-System, affecting an unspecified function within the /api/System.php file of the API module. The vulnerability is triggered by manipulation of the 'url' argument, which the system uses without adequate validation or sanitization, allowing attackers to make the server perform arbitrary HTTP requests. SSRF vulnerabilities can be leveraged to access internal services, bypass firewalls, or interact with sensitive backend infrastructure that is otherwise inaccessible externally. The vulnerability can be exploited remotely without any authentication or user interaction, increasing its risk profile. The product uses continuous delivery with rolling releases, complicating precise version identification, but patches have been committed under specific identifiers. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P) reflects network attack vector, low attack complexity, no privileges or user interaction required, and partial impacts on confidentiality, integrity, and availability. No known exploits are currently active in the wild, but public disclosure raises the risk of future exploitation. The vulnerability affects organizations using this CRM system, potentially exposing internal network resources and sensitive data to attackers.

The SSRF vulnerability in Jeson-CRM can have significant impacts on affected organizations. Attackers can exploit it to make the server send unauthorized requests to internal or external systems, potentially accessing sensitive internal services, metadata endpoints, or cloud provider APIs. This can lead to unauthorized data disclosure, internal network reconnaissance, or pivoting to further attacks such as lateral movement or privilege escalation. The integrity of internal systems may be compromised if attackers can interact with internal APIs or services. Availability could also be affected if attackers use SSRF to trigger denial-of-service conditions on internal resources. Since the vulnerability requires no authentication or user interaction, it can be exploited at scale by remote attackers. Organizations relying on Jeson-CRM for customer relationship management risk exposure of confidential customer data and disruption of business processes. The medium CVSS score reflects moderate but non-trivial risk, especially in environments with sensitive internal infrastructure behind the CRM server.

To mitigate CVE-2026-4623, organizations should immediately apply the vendor-provided patch identified by commit hashes f76e7123fe093b8675f88ec8f71725b0dd186310 and 98bd4eb07fa19d4f2c5228de6395580013c97476. Beyond patching, implement strict input validation and sanitization on all URL parameters to ensure only allowed and safe destinations can be requested. Employ allowlisting of outbound requests from the CRM server to restrict connections to trusted endpoints only. Network segmentation should isolate the CRM server from sensitive internal services to limit SSRF impact. Monitor outbound traffic logs for unusual or unexpected requests originating from the CRM server. Use web application firewalls (WAFs) with SSRF detection capabilities to block suspicious requests. Conduct regular security assessments and penetration testing focused on SSRF and related vulnerabilities. Finally, maintain up-to-date inventory and awareness of all CRM system components and their update status to ensure timely patching in continuous delivery environments.