CVE-2026-91506 in Workflow
Summary
by MITRE • 10/21/2026
Vulnerability in the Workflow product of Oracle E-Business Suite (component: Workflow Notification Mailer). Supported versions that are affected are 12.2.3-12.2.15. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Workflow. Successful attacks of this vulnerability can result in takeover of Workflow. CVSS 3.1 Base Score 8.1 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the Workflow Notification Mailer component of Oracle E-Business Suite, specifically affecting versions ranging from 12.2.3 through 12.2.15. This critical security flaw allows an unauthenticated attacker to compromise the integrity and availability of the workflow system by exploiting a difficult-to-exploit entry point accessible via HTTP network connections. The severity of this vulnerability is quantified by a CVSS 3.1 Base Score of 8.1, indicating a High risk level that demands immediate attention from system administrators and security operations teams responsible for maintaining Oracle E-Business Suite environments.
From a technical perspective, the core issue lies in insufficient input validation or authentication checks within the Workflow Notification Mailer service. Although the vector is classified as difficult to exploit due to high complexity requirements, the absence of required authentication (PR:N) combined with network accessibility (AV:N/UI:N) creates a significant attack surface. An attacker who successfully exploits this flaw can achieve complete takeover of the workflow subsystem. This capability implies that malicious actors could potentially manipulate notification processes, intercept sensitive data being transmitted via email workflows, or disrupt critical business operations dependent on automated notifications and task assignments within the enterprise suite.
The operational impact of such a compromise is severe, encompassing breaches in confidentiality, integrity, and availability as reflected by the CVSS vector components C:H/I:H/A:H. In terms of confidentiality, attackers may access proprietary workflow data, customer information, or internal business logic embedded in notification templates. Regarding integrity, unauthorized modifications to workflow states or configurations could lead to incorrect processing of transactions or approvals, causing financial loss or regulatory non-compliance. For availability, the ability to compromise the workflow engine can result in denial-of-service conditions where legitimate users are unable to trigger or complete essential business processes, effectively halting operational continuity for departments relying on these automated systems.
This vulnerability aligns with Common Weakness Enumeration (CWE) categories such as CWE-287: Improper Authentication and CWE-918: Server-Side Request Forgery (SSRF), depending on the specific mechanism of exploitation within the mailer component. In terms of the MITRE ATT&CK framework, this flaw facilitates techniques related to Initial Access via web applications and potentially Lateral Movement if the workflow engine has elevated privileges or access to other internal services. The high complexity requirement suggests that while automated scanning tools might detect the presence of vulnerable endpoints, successful exploitation likely requires manual crafting of specific HTTP requests with precise parameters, making it less susceptible to widespread opportunistic attacks but still dangerous against targeted adversaries.
Mitigation strategies must prioritize immediate patching to the latest supported version of Oracle E-Business Suite where this vulnerability is resolved. In scenarios where patching is not immediately feasible, organizations should implement strict network segmentation rules to restrict HTTP access to the Workflow Notification Mailer component only from trusted internal IP ranges or application servers that legitimately require interaction with it. Additionally, deploying a Web Application Firewall (WAF) with custom rules can help detect and block anomalous HTTP requests targeting this endpoint. Security teams should also audit existing workflow configurations for any signs of unauthorized modifications or unusual notification patterns that might indicate prior exploitation attempts. Regular vulnerability assessments focused on Oracle E-Business Suite components are essential to ensure ongoing protection against similar flaws in other modules.