Check Point Advisories

Alibaba Fastjson Remote Code Execution (CVE-2026-16723)

Vulnerability
Protection

Check Point Reference:	CPAI-2026-9631
Date Published:	26 Jul 2026
Severity:	Critical
Last Updated:	Sunday 26 July, 2026
Source:
Industry Reference:	CVE-2026-16723
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Alibaba Fastjson 1.2.68 through 1.2.83
Vulnerability Description	A remote code execution vulnerability in Alibaba Fastjson allows remote attackers to execute arbitrary code by exploiting the stock default configuration without requiring AutoType enablement or a classpath gadget.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R81 / R80 / R77 / R75

In the IPS tab, click Protections and find the Alibaba Fastjson Remote Code Execution (CVE-2026-16723) protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Web Server Enforcement Violation.
Attack Information: Alibaba Fastjson Remote Code Execution (CVE-2026-16723)