CVE-2026-91348 in Solaris
Summary
by MITRE • 10/21/2026
Vulnerability in the Oracle Solaris product of Oracle Systems (component: Utility). Supported versions that are affected are 11.3 and 11.4. Easily exploitable vulnerability allows unauthenticated attacker with logon to the infrastructure where Oracle Solaris executes to compromise Oracle Solaris. Successful attacks of this vulnerability can result in takeover of Oracle Solaris. CVSS 3.1 Base Score 8.4 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the Utility component of Oracle Solaris versions 11.3 and 11.4, representing a significant security risk for systems running these specific releases. This flaw is characterized by an easily exploitable condition that permits unauthenticated attackers to compromise the integrity and availability of the operating system. The attack vector requires local access with valid logon credentials on the infrastructure where Oracle Solaris is executing, indicating that while remote exploitation is not directly possible without prior network penetration or physical access, the barrier for entry is relatively low once an attacker gains a foothold within the environment.
From a technical perspective, this vulnerability allows an unauthenticated user to escalate privileges and ultimately take full control of the host system. The high severity score reflects the comprehensive impact on confidentiality, integrity, and availability. An attacker leveraging this flaw can bypass standard security controls, potentially leading to complete system takeover. This level of compromise enables the execution of arbitrary code with elevated permissions, modification or deletion of critical system files, and access to sensitive data stored on the compromised host. The operational impact is severe as it undermines the foundational trust in the operating system's ability to isolate user processes and enforce security boundaries.
In terms of industry standards classification, this vulnerability aligns closely with CWE-269 Improper Privilege Management or potentially CWE-78 OS Command Injection depending on the specific mechanism within the Utility component that is being exploited. The attack pattern corresponds to MITRE ATT&CK techniques involving Local Account Manipulation and Defense Evasion, as an attacker would likely use this initial access point to establish persistence and escalate privileges to gain administrative control over the Solaris environment. Understanding these mappings helps in aligning remediation efforts with broader security frameworks and threat intelligence models.
Mitigation strategies must prioritize immediate patching of all affected Oracle Solaris instances running versions 11.3 and 11.4. Organizations should apply the latest vendor-supplied patches that address this specific flaw within the Utility component. In addition to patching, it is critical to enforce strict access controls on systems hosting these vulnerabilities. Implementing principle of least privilege ensures that even if an attacker gains initial logon credentials, their ability to exploit local flaws for escalation is limited by restrictive user permissions and role-based access control policies. Network segmentation should also be reviewed to ensure that compromised hosts cannot easily pivot to more critical assets within the infrastructure. Regular vulnerability scanning and continuous monitoring for anomalous privilege changes are essential components of a defense-in-depth strategy against such local exploitation attempts.