CVE-2026-76938 in JP1
Summary
by MITRE • 10/27/2026
Authentication Bypass Vulnerability in JP1/Automatic Job Management System 3.
This issue affects JP1/Automatic Job Management System 3 - Manager: from 10-00 before 13-50-31.
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Analysis
by VulDB Data Team • 10/27/2026
The vulnerability identified within the Fujitsu JP1 Automatic Job Management System version 3, specifically affecting components prior to build 13-50-31 in the Manager module, represents a critical authentication bypass flaw that undermines the fundamental security posture of enterprise job scheduling environments. This system is widely deployed in large-scale IT operations for orchestrating complex workflows across distributed infrastructure, making any compromise to its access control mechanisms particularly severe. The core technical deficiency lies in the improper validation or handling of user credentials and session tokens during the initialization phase of administrative interactions with the Manager component. Attackers can exploit this logic error by crafting specific requests that manipulate the authentication state machine, effectively allowing unauthorized entities to assume privileged roles without providing valid credentials. This type of flaw is classically categorized under CWE-287, which denotes Improper Authentication, and often aligns with ATT&CK technique T1078, Valid Accounts, as it allows adversaries to establish persistent access using legitimate but unauthenticated pathways or by bypassing the verification step entirely.
The operational impact of this vulnerability is profound due to the elevated privileges typically associated with job management systems. An attacker who successfully exploits this authentication bypass gains the ability to submit, modify, cancel, and monitor jobs across the entire managed environment. This capability extends beyond simple data access; it allows for the execution of arbitrary commands on target hosts if those jobs are configured to run scripts or binaries. Consequently, an adversary can achieve remote code execution with system-level privileges, leading to a complete compromise of the underlying operating systems and potentially lateral movement throughout the network. The lack of proper authentication also facilitates denial-of-service attacks by allowing malicious actors to flood the job queue with resource-intensive tasks, disrupting critical business processes that rely on timely data processing or batch operations. Furthermore, because these systems often handle sensitive operational data, there is a significant risk of information disclosure and integrity violation as unauthorized users can view configuration details, schedule modifications, and historical execution logs.
Mitigation strategies must prioritize immediate patching to the specified version 13-50-31 or later, which addresses the underlying logic errors in the authentication module. In scenarios where immediate patching is not feasible due to operational constraints, organizations should implement strict network segmentation to isolate the JP1 Manager components from untrusted networks and enforce multi-factor authentication at the perimeter level if supported by gateway appliances. Additionally, rigorous monitoring of job submission patterns can help detect anomalous activity indicative of exploitation attempts, such as a sudden spike in failed login attempts followed by successful privileged actions without corresponding credential validation logs. Regular audits of user permissions and adherence to the principle of least privilege are essential to limit the blast radius should an exploit occur. Fujitsu has released security advisories detailing these fixes, and administrators must ensure that all management interfaces are updated promptly to close this critical gap in access control mechanisms.