CVE-2026-91541 in PeopleSoft Enterprise FIN Common Objects Brazil
Summary
by MITRE • 10/21/2026
Vulnerability in the PeopleSoft Enterprise FIN Common Objects Brazil product of Oracle PeopleSoft (component: Common Objects). The supported version that is affected is 9.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise PeopleSoft Enterprise FIN Common Objects Brazil. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of PeopleSoft Enterprise FIN Common Objects Brazil accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of PeopleSoft Enterprise FIN Common Objects Brazil. CVSS 3.1 Base Score 6.5 (Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L).
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified in Oracle PeopleSoft Enterprise FIN Common Objects Brazil, specifically within version 9.1 of the Common Objects component, represents a significant security risk due to its exploitable nature by unauthenticated actors over network-accessible HTTP connections. This flaw allows an attacker with no prior authentication credentials to compromise the integrity and availability of the application environment. The presence of this vulnerability indicates a failure in input validation or access control mechanisms within the Brazilian financial common objects module, which is critical for processing regional financial data and compliance requirements specific to Brazil.
From a technical perspective, the core issue lies in the insufficient sanitization of user-supplied inputs received via HTTP requests. This deficiency enables an attacker to inject malicious commands or malformed data that bypasses existing security controls. Because the vulnerability does not require authentication, it is classified as easily exploitable by any remote actor who can reach the target system over a network. The attack vector leverages standard web protocols, making detection and prevention more challenging without specialized monitoring tools that inspect payload content rather than just access patterns.
The operational impact of this vulnerability is twofold, affecting both data integrity and service availability. On the integrity front, successful exploitation allows unauthorized updates, inserts, or deletes to accessible data within the PeopleSoft environment. This means an attacker could alter financial records, manipulate transactional data, or delete critical information, leading to potential regulatory non-compliance and financial loss for organizations relying on accurate reporting from this module. The ability to modify data without authorization undermines the trustworthiness of the entire enterprise resource planning system.
Regarding availability, the vulnerability also facilitates a partial denial of service attack. By sending specific malformed requests or triggering error conditions within the Common Objects component, an attacker can cause the application to become unresponsive or crash partially. This disruption impacts business operations that depend on continuous access to financial data and processes. While it may not result in a complete system outage, even intermittent downtime can have severe consequences for time-sensitive financial transactions and reporting cycles.
In terms of industry standard classifications, this vulnerability aligns with CWE-20 Improper Input Validation, as the root cause is likely the failure to properly validate or sanitize data received from users. Additionally, it relates to CWE-798 Use of Hard-coded Credentials if authentication bypasses are involved in the exploitation chain, though the primary vector described emphasizes unauthenticated access via HTTP flaws. From a tactical standpoint on the MITRE ATT&CK framework, this vulnerability supports techniques associated with Initial Access and potentially Impact categories such as Data Manipulation or Service Stoppage, depending on how the denial of service is executed.
Mitigation strategies must focus on immediate patching and enhanced monitoring. Organizations running PeopleSoft Enterprise FIN Common Objects Brazil version 9.1 should apply the latest security patches provided by Oracle to address these specific flaws in input handling and access control logic. Until patches are applied, network-level controls such as Web Application Firewalls can be configured to detect and block suspicious HTTP payloads that exhibit patterns of injection or exploitation attempts. Furthermore, implementing strict rate limiting on endpoints exposed through this component can help mitigate the risk of denial-of-service attacks by preventing rapid-fire requests from overwhelming system resources.
Long-term remediation should involve a comprehensive review of all custom code within the Common Objects module to ensure robust input validation practices are enforced across all HTTP interfaces. Security teams should also consider segmenting network access to PeopleSoft environments, restricting direct internet exposure where possible and requiring VPN or other secure tunneling methods for administrative and user access. Regular vulnerability assessments focused on web application security will help identify similar weaknesses in other modules before they can be exploited by malicious actors seeking to compromise financial data integrity or disrupt business continuity.