CVE-2026-87421 in Solaris
Summary
by MITRE • 10/21/2026
Vulnerability in the Oracle Solaris product of Oracle Systems (component: Image Packaging System). The supported version that is affected is 11.4. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Solaris. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Solaris accessible data as well as unauthorized update, insert or delete access to some of Oracle Solaris accessible data. CVSS 3.1 Base Score 7.1 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N).
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified in the Oracle Solaris Image Packaging System, specifically affecting version 11.4, represents a significant security risk due to its potential for remote exploitation via standard web protocols. The core of this issue lies within the component responsible for managing software packages and updates on the operating system. This subsystem is critical as it handles the integrity and availability of installed applications and system utilities. When an attacker leverages this flaw, they can bypass authentication mechanisms entirely, gaining access through Hypertext Transfer Protocol without requiring valid credentials. This lack of required authentication lowers the barrier to entry for malicious actors, allowing them to interact directly with the package management infrastructure over a network connection.
The technical nature of this vulnerability involves a failure in input validation or state handling within the Image Packaging System that permits unauthorized modifications when triggered by specific HTTP requests. Although the attack vector is remote and unauthenticated, it requires human interaction from a user other than the attacker to complete successfully. This social engineering aspect suggests that the exploit likely relies on tricking an administrator or end-user into performing an action, such as clicking a malicious link or approving a deceptive update prompt, which then triggers the underlying code flaw. Once this interaction occurs, the system's security controls are circumvented, allowing the attacker to execute commands or alter data structures within the package management database.
The operational impact of exploiting this vulnerability is severe, primarily targeting the confidentiality and integrity of the Oracle Solaris environment while leaving availability largely unaffected according to the provided metrics. Successful exploitation grants unauthorized access to critical system data, potentially exposing sensitive configuration files, user credentials stored in associated databases, or proprietary application logic contained within installed packages. Furthermore, the attacker gains the ability to modify this data by inserting new malicious packages, deleting essential security patches, or altering existing configurations. This level of control can lead to a complete compromise of the host system's integrity, as attackers could install backdoors, rootkits, or other persistent threats disguised as legitimate software updates.
From an industry standards perspective, this vulnerability aligns with Common Weakness Enumeration categories such as CWE-20 Improper Input Validation and potentially CWE-434 Unrestricted Upload of File with Dangerous Type if the flaw involves package file handling. In terms of attack tactics, it maps to MITRE ATT&CK techniques related to Initial Access via Phishing or Trusted Relationship Abuse, followed by Execution through System Services or Command Line Utilities. The requirement for human interaction places this firmly in the realm of social engineering combined with technical exploitation, making defense-in-depth strategies essential rather than relying solely on perimeter security controls.
Mitigation efforts must focus on both immediate remediation and long-term architectural improvements. Oracle has likely released patches addressing this specific flaw within the Image Packaging System component; therefore, applying the latest updates for Solaris 11.4 is the primary corrective action. Administrators should also enforce strict network segmentation to limit HTTP access to package management services from untrusted networks. Additionally, implementing multi-factor authentication where possible and restricting administrative privileges can reduce the risk of successful exploitation even if a user interacts with malicious content. Security awareness training is crucial to mitigate the human interaction vector, ensuring that personnel are vigilant against deceptive prompts related to system updates or software installations. Regular auditing of package repositories and monitoring for unauthorized changes in the IPS database will also aid in early detection of any attempted compromises.