importantSYS.SOURCE: The Hacker News• 2026-07-25T18:22:43+05:30

Critical Fastjson 1.x RCE Vulnerability Exploited in Active Attacks Without Available Patch

#vulnerability #remote code execution #java security #open source security #patch management

A critical remote code execution (RCE) vulnerability in Fastjson 1.x (CVE-2026-16723) is being actively exploited without a patched version available, allowing unauthenticated attackers to execute arbitrary code in affected Spring Boot applications. Organizations are advised to enable SafeMode or migrate to Fastjson2 as temporary mitigations while Alibaba works on a permanent fix.

Security firms ThreatBook and Imperva say attackers are targeting a critical flaw in Fastjson, Alibaba's JSON library for Java. In affected Spring Boot applications, a malicious JSON request can execute code without authentication, with the privileges of the Java process.

Tracked as CVE-2026-16723, the vulnerability carries an Alibaba-assigned CVSS score of 9.0. The confirmed chain requires

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> ADOBE CAMPAIGN CLASSIC CVSS 10.0 CRITICAL VULNERABILITY ENABLES ARBITRARY CODE EXECUTION WITHOUT USER INTERACTION > HIJACKED HOTEL WI-FI NETWORKS EXPLOIT FAKE UPDATES TO DEPLOY SURVEILLANCE MALWARE > TEN CRITICAL ISSUES IMPACTING NAS SYSTEMS > THE PURPOSE AND VALUE OF LIBERAL ARTS EDUCATION IN MODERN CAREER DEVELOPMENT > DEVELOPMENT PIPELINE AS CRITICAL PRODUCTION SYSTEM IN SOFTWARE ENGINEERING > FLINT: A VISUALIZATION LANGUAGE FOR THE AI ERA > CHALLENGES IN MODERATING A MATRIX COMMUNITY: A WEEK-LONG EXPERIENCE > THE CHALLENGE OF EXISTENCE: A MINDFULNESS PRACTICE FOR PRESENT-MOMENT AWARENESS > OPENAI INVESTIGATES MULTIPLE AI AGENT ESCAPES FROM TEST ENVIRONMENTS > RIVIAN SPINOFF ALSO BEGINS E-BIKE DELIVERIES AMID SUPPLY CHAIN CHALLENGES> ADOBE CAMPAIGN CLASSIC CVSS 10.0 CRITICAL VULNERABILITY ENABLES ARBITRARY CODE EXECUTION WITHOUT USER INTERACTION > HIJACKED HOTEL WI-FI NETWORKS EXPLOIT FAKE UPDATES TO DEPLOY SURVEILLANCE MALWARE > TEN CRITICAL ISSUES IMPACTING NAS SYSTEMS > THE PURPOSE AND VALUE OF LIBERAL ARTS EDUCATION IN MODERN CAREER DEVELOPMENT > DEVELOPMENT PIPELINE AS CRITICAL PRODUCTION SYSTEM IN SOFTWARE ENGINEERING > FLINT: A VISUALIZATION LANGUAGE FOR THE AI ERA > CHALLENGES IN MODERATING A MATRIX COMMUNITY: A WEEK-LONG EXPERIENCE > THE CHALLENGE OF EXISTENCE: A MINDFULNESS PRACTICE FOR PRESENT-MOMENT AWARENESS > OPENAI INVESTIGATES MULTIPLE AI AGENT ESCAPES FROM TEST ENVIRONMENTS > RIVIAN SPINOFF ALSO BEGINS E-BIKE DELIVERIES AMID SUPPLY CHAIN CHALLENGES