Which versions of PHP are affected by CVE-2026-4623?

A Server-Side Request Forgery vulnerability in the Jeson-Customer-Relationship-Management-System allows attackers to manipulate the server into making unauthorized requests, potentially exposing…. A patch is available.

Is there a public PoC exploit available for CVE-2026-4623?

Yes, a public proof-of-concept exploit is available for CVE-2026-4623. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-4623?

Within 24 hours: Identify all systems running affected versions (up to commit 1b4679c4d06b90d31dd521c2b000bfdec5a36e00) and assess exposure to internet-facing traffic. Within 7 days: Apply vendor patches to all affected instances in production and staging environments. Within 30 days: Conduct post-patch validation testing and review access logs for evidence of exploitation attempts.

PHP CVE-2026-4623

Q: What is the CVSS score of CVE-2026-4623?

CVE-2026-4623 has a CVSS 4.0 base score of 5.5 (Medium). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

EUVD-2026-14696 MEDIUM

Server-Side Request Forgery (SSRF) (CWE-918)

2026-03-24 VulDB

PHP SSRF Jeson Customer Relationship Management System Defaultfuction

5.5

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

5.5 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

CVSS changed

Apr 29, 2026 - 01:11 NVD

6.9 (MEDIUM) 5.5 (MEDIUM)

Severity Changed

Apr 24, 2026 - 16:37 NVD

HIGH MEDIUM

CVSS changed

Apr 24, 2026 - 16:37 NVD

7.3 (HIGH) 6.9 (MEDIUM)

PoC Detected

Mar 24, 2026 - 15:53 vuln.today

Public exploit code

EUVD ID Assigned

Mar 24, 2026 - 02:45 euvd

EUVD-2026-14696

Analysis Generated

Mar 24, 2026 - 02:45 vuln.today

Patch released

Mar 24, 2026 - 02:45 nvd

Patch available

CVE Published

Mar 24, 2026 - 01:39 nvd

HIGH 7.3

DescriptionCVE.org

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.

AnalysisAI

A Server-Side Request Forgery (SSRF) vulnerability exists in DefaultFuction Jeson-Customer-Relationship-Management-System affecting versions up to commit 1b4679c4d06b90d31dd521c2b000bfdec5a36e00. The vulnerability resides in the /api/System.php file where the 'url' parameter can be manipulated to force the server to make arbitrary requests. A publicly disclosed proof-of-concept exploit is available on GitHub, and patches have been released by the vendor.

Technical ContextAI

The vulnerability affects the Jeson Customer Relationship Management System (cpe:2.3:a:defaultfuction:jeson-customer-relationship-management-system:*:*:*:*:*:*:*:*), a PHP-based CRM application. The root cause is CWE-918 (Server-Side Request Forgery), where the API Module's System.php file fails to properly validate the 'url' argument before processing it. This allows attackers to abuse the server as a proxy to make requests to internal resources, cloud metadata services, or external systems that trust requests originating from the vulnerable server. The product uses continuous delivery with rolling releases, making traditional version tracking unavailable.

RemediationAI

Update to a version containing the security patch by applying commit f76e7123fe093b8675f88ec8f71725b0dd186310 or 98bd4eb07fa19d4f2c5228de6395580013c97476 available at https://github.com/DefaultFuction/Jeson-Customer-Relationship-Management-System/commit/f76e7123fe093b8675f88ec8f71725b0dd186310. Organizations should pull the latest code from the GitHub repository at https://github.com/DefaultFuction/Jeson-Customer-Relationship-Management-System/ to ensure the fix is applied. As an interim mitigation until patching is completed, implement network-level controls such as restricting the /api/System.php endpoint to authenticated users only, deploying a web application firewall (WAF) with rules to detect and block SSRF attempts, and restricting outbound connections from the application server to prevent access to internal networks and cloud metadata endpoints (169.254.169.254).