CVE-2026-91342 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 creation, deletion or modification access to critical data or all Oracle Outside In Technology accessible data as well as unauthorized read access to a subset 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:L/I:H/A:N).
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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 across various enterprise applications to parse and sanitize complex file formats such as PDFs, Microsoft Office documents, CAD files, and other rich media types before they are rendered or processed by the host application. The presence of this flaw introduces a critical security risk because it allows an unauthenticated attacker with network access via HTTP to exploit the vulnerability remotely. Unlike many vulnerabilities that require local system privileges or complex authentication bypasses, this issue can be triggered simply by directing a victim user to a maliciously crafted resource accessible over standard web protocols, significantly lowering the barrier for entry for potential adversaries targeting organizations relying on Oracle Fusion Middleware for content management and document processing workflows.
The technical nature of this flaw involves a logic error or buffer handling deficiency within the parsing engine that fails to properly validate input data before execution. While the specific exploit vector is not detailed in the summary, such vulnerabilities typically stem from improper boundary checks or type confusion errors when processing malformed inputs embedded within supported file formats. The requirement for human interaction indicates that this vulnerability likely relies on social engineering tactics, where an attacker must trick a user into opening a malicious document or visiting a compromised webpage that triggers the exploit through automatic rendering mechanisms inherent in many web browsers and client applications. This dependency on user action classifies the attack complexity as low from a technical standpoint but adds a layer of operational defense by requiring active participation from the end-user, although modern phishing techniques have made this interaction increasingly common and difficult to prevent without strict security controls.
The impact of a successful exploitation is severe, characterized by significant changes in scope due to the pervasive nature of Oracle Outside In Technology within enterprise environments. Although the vulnerability exists specifically within the Outside In component, its compromise can lead to lateral movement or privilege escalation that affects additional products integrated with it. The primary consequences involve unauthorized creation, deletion, or modification of critical data and all accessible data managed by Oracle Outside In Technology. This represents a high integrity impact, as attackers could alter documents, inject malicious content into reports, or destroy essential records without detection. Additionally, there is an unauthorized read access to a subset of the accessible data, indicating that sensitive information stored within processed files can be exfiltrated. The combination of confidentiality and integrity impacts results in a CVSS 3.1 Base Score of 8.2, reflecting a high severity rating that demands immediate attention from security operations teams responsible for maintaining the integrity of enterprise document repositories.
From an industry standard perspective, this vulnerability aligns with CWE-94, which describes Improper Control of Generation of Code (Code Injection), or potentially CWE-119 if it involves buffer overflow conditions leading to arbitrary code execution. The attack vector corresponds to MITRE ATT&CK technique T1059, Command and Scripting Interpreter, particularly when the exploitation leads to remote command execution on the host system. Furthermore, the requirement for user interaction places this within the context of Initial Access techniques such as Spearphishing Attachment (T1566.001) or Drive-by Compromise (T1189), depending on whether the payload is delivered via a malicious file or a compromised website hosting exploit code. Understanding these mappings helps security teams prioritize patching efforts and implement detection rules based on known indicators of compromise associated with these specific tactics, techniques, and procedures used by threat actors targeting document parsing libraries.
To mitigate this risk, organizations must immediately apply the latest available patches for Oracle Fusion Middleware version 8.5.8 or upgrade to a supported version where the flaw has been remediated in the Outside In Clean Content SDK. Since the vulnerability requires network access via HTTP, restricting direct external access to systems running vulnerable components through firewalls and web application firewalls can reduce the attack surface. Implementing strict content filtering policies that inspect incoming documents for malicious structures before they reach the parsing engine is also advisable. Additionally, user awareness training should be reinforced to minimize the success rate of social engineering attacks that rely on human interaction to trigger the exploit. Regular vulnerability scanning focused on document processing services and monitoring for anomalous behavior in file handling processes will further enhance the organization's defensive posture against this specific threat vector.