CVE-2026-91346 in Outside In Technology
Summary
by MITRE • 10/21/2026
Vulnerability in the Oracle Outside In Technology product of Oracle Fusion Middleware (component: Outside In Clean Content SDK). The supported version that is affected is 8.5.8. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Outside In Technology. Successful attacks require human interaction from a person other than the attacker and while the vulnerability is in Oracle Outside In Technology, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Outside In Technology accessible data as well as unauthorized update, insert or delete access to some of Oracle Outside In Technology accessible data. CVSS 3.1 Base Score 8.2 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N).
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified in Oracle Outside In Technology, specifically within the Clean Content SDK component of version 8.5.8, represents a significant security risk to organizations relying on this middleware for document processing and content sanitization. This flaw is classified as an easily exploitable issue that allows unauthenticated attackers with network access via HTTP to compromise the system. The core technical nature of this vulnerability aligns with CWE-20 Improper Input Validation or potentially CWE-78 OS Command Injection, depending on the specific trigger mechanism within the SDK's parsing routines. When maliciously crafted content is processed by the Clean Content SDK, it fails to adequately sanitize inputs before execution or memory manipulation, allowing an attacker to inject arbitrary commands or exploit buffer overflows that lead to unauthorized code execution. This lack of rigorous input validation enables the attacker to bypass standard security controls and interact directly with the underlying operating system or application logic through the HTTP interface provided by Oracle Fusion Middleware.
The operational impact of this vulnerability is severe due to its high privilege level despite requiring human interaction for initial exploitation. Although the attack vector requires a user other than the attacker to perform an action, such as opening a maliciously crafted document in a compatible viewer integrated with Outside In Technology, the subsequent compromise grants extensive control over the affected system. Successful exploitation results in unauthorized access to critical data and complete access to all Oracle Outside In Technology accessible data, indicating a high impact on confidentiality. Furthermore, the vulnerability allows for unauthorized updates, inserts, or deletes of data within the scope of the technology's permissions, leading to significant integrity violations. The CVSS 3.1 base score of 8.2 reflects these substantial impacts on confidentiality and integrity, while availability remains unaffected in this specific scenario. This combination suggests that an attacker can not only steal sensitive information but also alter or destroy data, potentially disrupting business operations and compromising the trustworthiness of stored records.
From a threat modeling perspective, this vulnerability maps to ATT&CK techniques involving Initial Access through Trusted Software Distribution if delivered via phishing, followed by Execution and Persistence mechanisms enabled by the compromised middleware. The scope change noted in the advisory is critical; while the flaw resides within Oracle Outside In Technology, its integration into broader enterprise applications means that compromising it can lead to lateral movement or privilege escalation across multiple dependent products. This expands the blast radius of a single vulnerability beyond the immediate component, affecting the entire security perimeter managed by Fusion Middleware administrators. The requirement for human interaction lowers the attack complexity but does not eliminate the risk, as social engineering tactics are frequently employed in targeted attacks against enterprise environments.
Mitigation strategies must focus on both technical controls and procedural changes to reduce exposure. Immediate remediation involves applying the latest patches provided by Oracle for version 8.5.8 or upgrading to a supported version where this flaw has been addressed. In scenarios where patching is not immediately feasible, network segmentation should be enforced to restrict HTTP access to the Outside In Technology components from untrusted networks. Additionally, implementing strict input validation at the application layer that consumes data before it reaches the SDK can provide an additional defense-in-depth measure. Security awareness training for end-users is also essential to mitigate the human interaction requirement, ensuring they are vigilant against opening unexpected or suspicious documents. Regular vulnerability scanning and monitoring of HTTP traffic for anomalous patterns related to document processing requests can help in early detection of exploitation attempts. Organizations must treat this issue with high priority due to its potential for significant data breach and integrity loss within their middleware infrastructure.