CVE-2026-91341 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 of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle Outside In Technology accessible data and unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Outside In Technology. CVSS 3.1 Base Score 9.1 (Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the Outside In Clean Content SDK, a core component of Oracle Fusion Middleware's Outside In Technology suite, specifically affecting version 8.5.8. This software library is widely deployed to parse and analyze various file formats for malicious content before they are processed by enterprise applications. The flaw represents a critical security deficiency that allows an unauthenticated attacker with network access via HTTP to compromise the integrity and availability of the system. Because the vulnerability can be exploited remotely without any form of authentication or user interaction, it presents a severe risk profile where automated scanning tools could potentially identify and exploit this weakness across large networks containing vulnerable instances.
From a technical perspective, the root cause lies in how the Clean Content SDK handles specific input data structures during its parsing routines. The vulnerability likely stems from improper validation or bounds checking within the code that processes incoming file streams or HTTP requests directed at the service endpoints exposed by Outside In Technology. When an attacker crafts a malicious payload designed to trigger this flaw, it leads to memory corruption or logic errors that disrupt normal operation. This is consistent with common classes of vulnerabilities found in complex parsing libraries, such as buffer overflows or heap-based deserialization issues, which are frequently categorized under CWE-120 for Buffer Copy without Checking Size of Input and potentially CWE-400 for Uncontrolled Resource Consumption if the flaw leads to resource exhaustion states.
The operational impact of a successful exploitation is significant, primarily targeting data integrity and system availability as indicated by the high CVSS 3.1 base score of 9.1. An attacker who successfully exploits this vulnerability can achieve unauthorized creation, deletion, or modification of critical data accessible through Oracle Outside In Technology. This compromises the confidentiality and trustworthiness of the information processed by the middleware. Furthermore, the vulnerability allows for a complete denial of service condition characterized by hangs or frequently repeatable crashes. This means that even if an attacker does not seek to exfiltrate or alter data, they can effectively render the Oracle Fusion Middleware services unavailable to legitimate users, causing substantial business disruption and potential financial loss due to downtime.
In terms of threat modeling and industry standards, this vulnerability aligns with ATT&CK techniques related to Initial Access via Exploit Public-Facing Application (T1190) and potentially Impact through Denial of Service or Data Manipulation depending on the specific exploitation vector used by an adversary. The lack of authentication requirements places it in a high-risk category where automated attacks are highly probable. Organizations relying on Oracle Fusion Middleware must recognize that this component is often exposed to internal networks or, in some configurations, external-facing services, making it a prime target for opportunistic attackers seeking to establish persistence or disrupt operations without needing valid credentials.
Mitigation strategies should prioritize immediate patching of the Outside In Technology product to the latest available version released by Oracle, which addresses the underlying code flaws within the Clean Content SDK. Until patches are applied, organizations should implement strict network segmentation rules to restrict HTTP access to the affected services only from trusted IP ranges or internal subnets that require such functionality. Additionally, deploying Web Application Firewalls with specific signatures for known Outside In exploitation attempts can provide a layer of defense against remote code execution and denial-of-service attacks. Regular vulnerability scanning focused on middleware components is essential to detect unpatched instances before they are targeted by automated exploit kits prevalent in the current threat landscape.