CVE-2026-91349 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 product. This flaw is classified under CWE-400, which denotes uncontrolled resource consumption leading to denial-of-service conditions. The core technical issue stems from improper handling of specific input data processed by the Clean Content SDK during HTTP-based interactions. When an attacker sends specially crafted requests via the Hypertext Transfer Protocol, the underlying processing logic fails to adequately validate or bound the resources required for parsing and cleaning content. This deficiency allows a remote actor to trigger internal state corruption or infinite loops within the application server hosting Oracle Fusion Middleware. The vulnerability is particularly severe because it requires no authentication, meaning any entity with network access to the affected service can exploit this flaw without needing valid credentials or user interaction.
From an operational perspective, the impact of this vulnerability is strictly limited to availability rather than confidentiality or integrity. Successful exploitation results in a complete denial-of-service condition where Oracle Outside In Technology becomes unresponsive due to hangs or frequent crashes. This effectively halts any business processes that depend on content conversion and cleaning services provided by the middleware. For enterprises using Oracle Fusion Middleware for document management, web application firewalls, or other content processing pipelines, this outage can lead to significant operational disruption. The CVSS 3.1 base score of 7.5 reflects the high severity associated with remote exploitation without authentication that leads to total service unavailability. Attackers leveraging this flaw align with ATT&CK technique T1499, Endpoint Denial of Service, by overwhelming system resources or crashing critical services to disrupt normal operations.
Mitigation strategies must focus on immediate patching and network-level controls until the software is updated. Oracle has released patches for version 8.5.8 that address this specific flaw in the Clean Content SDK. Organizations should prioritize applying these updates as soon as possible to restore service stability. In environments where immediate patching is not feasible, implementing strict access control lists on firewalls and reverse proxies can help mitigate risk by restricting HTTP traffic from untrusted networks to only authorized IP addresses. Additionally, deploying intrusion prevention systems with signatures capable of detecting malformed content requests targeting the Outside In SDK may provide an additional layer of defense against exploitation attempts. Regular monitoring for unusual spikes in resource consumption or service restarts associated with Oracle Fusion Middleware components can also aid in early detection of potential attacks exploiting this vulnerability.