Cybersecurity · 184 views
Fastjson 1.x RCE Vulnerability Targeted in Attacks With No Patched Available
Fastjson 1.x flaw CVE-2026-16723 can trigger unauthenticated RCE in Spring Boot fat-JAR apps, with attacks reported and no patched 1.x fix available.
AI Summary
A critical vulnerability in Fastjson, a widely used JSON library for Java, has been targeted in attacks. The flaw, tracked as CVE-2026-16723, allows malicious JSON requests to execute code without authentication, with the privileges of the Java process. This vulnerability is particularly concerning in affected Spring Boot applications, where it can be exploited to gain unauthorized access. The CVSS score assigned by Alibaba is 9.0, indicating a high severity level. The confirmed chain of exploitation is still being analyzed. The lack of a patched version available for Fastjson 1.x exacerbates the situation, leaving users vulnerable to attacks. Security firms ThreatBook and Imperva have reported the targeting of this vulnerability, highlighting the need for immediate attention and mitigation.
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