CVE-2026-91345 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 ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Outside In Technology. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
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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 critical availability risk for organizations relying on this middleware infrastructure. This flaw is classified under CWE-400, which denotes uncontrolled resource consumption, and aligns with MITRE ATT&CK technique T1499, Endpoint Denial of Service. The core technical issue stems from improper handling of specific input data within the content parsing engine, allowing an attacker to trigger a state where the application consumes excessive resources or enters an unrecoverable loop. Because Oracle Outside In Technology is frequently used as a backend service for document conversion and previewing in enterprise applications such as ERP systems, email gateways, and collaboration platforms, this vulnerability poses a significant threat to operational continuity.
Exploitation of this flaw requires no authentication and can be executed remotely over HTTP with low complexity. An unauthenticated attacker on the network can craft malicious requests that target the vulnerable parsing logic within the Clean Content SDK. Upon receiving these specially crafted inputs, the service fails to properly validate or bound the resource allocation for processing the content. This leads directly to a complete denial of service condition where the Oracle Outside In Technology process hangs or crashes repeatedly. The impact is strictly on availability, as indicated by the CVSS 3.1 base score of 7.5 and the vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. There are no direct implications for confidentiality or integrity in this specific exploit scenario; however, the loss of service can cascade into broader system outages if the middleware is a single point of failure for critical business processes.
The operational impact extends beyond simple downtime. In environments where Oracle Fusion Middleware supports high-throughput document processing, such as legal discovery platforms or financial reporting systems, repeated crashes can lead to data ingestion backlogs and user frustration. Furthermore, because the vulnerability allows for repeatable crashes, it facilitates persistent denial-of-service attacks that are difficult to mitigate through standard rate-limiting alone if the underlying parsing logic remains vulnerable. Attackers can sustain these disruptions with minimal effort, leveraging the low attack complexity and lack of required authentication vectors. This makes the vulnerability particularly attractive for opportunistic attackers seeking to disrupt services without needing elevated privileges or complex exploit chains.
Mitigation strategies must prioritize immediate patching where feasible. Oracle has released updates that address this resource handling flaw in subsequent versions of Outside In Technology. Organizations should assess their current deployment and apply the latest security patches provided by Oracle. If upgrading is not immediately possible, network-level controls such as Web Application Firewalls can be configured to inspect HTTP traffic for patterns indicative of malicious content parsing attempts targeting the Clean Content SDK endpoints. Additionally, implementing strict input validation at the application layer before data reaches the middleware component can reduce exposure. Monitoring tools should be tuned to detect abnormal spikes in CPU or memory usage associated with Oracle Outside In processes, which may indicate an ongoing exploitation attempt. Regular vulnerability scanning and adherence to secure coding practices for any custom integrations using this SDK are essential long-term defenses against similar resource exhaustion vulnerabilities.