CVE-2026-91518 in BI Publisher
Summary
by MITRE • 10/21/2026
Vulnerability in the Oracle BI Publisher product of Oracle Analytics (component: BI Publisher Security). Supported versions that are affected are 8.2.0.0.0, 12.2.1.4.0 and 26.01.0.0.0. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle BI Publisher. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle BI Publisher accessible data as well as unauthorized read access to a subset of Oracle BI Publisher accessible data. CVSS 3.1 Base Score 5.4 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the BI Publisher Security component of Oracle Analytics, specifically affecting supported versions including 8.2.0.0.0, 12.2.1.4.0, and 26.01.0.0. This flaw represents a significant security gap that allows for unauthorized manipulation and access to data managed by the BI Publisher service. The vulnerability is characterized as easily exploitable, requiring only low-privileged credentials from an attacker who has network connectivity via HTTP to the target system. This accessibility profile indicates that the attack vector does not require complex social engineering or physical proximity, making it a viable threat for remote adversaries operating within the same network segment or those with access through exposed web services.
From a technical perspective, the core issue lies in insufficient authorization checks or input validation mechanisms within the BI Publisher security module. The flaw enables an attacker to perform unauthorized update, insert, and delete operations on accessible data, as well as read access to a subset of that same data. This behavior aligns with CWE-269, which describes Improper Privilege Management, where the application fails to enforce proper restrictions on user actions based on their assigned roles or permissions. Furthermore, the ability to modify existing records and insert new ones points towards CWE-74, specifically Injection flaws in XML processing if the vulnerability involves parsing untrusted input that alters data structures, or more broadly CWE-918 for Server-Side Request Forgery if the attack leverages internal network resources. The lack of adequate separation between read-only roles and administrative write privileges is a common architectural weakness in such enterprise reporting tools when not properly hardened.
The operational impact of this vulnerability is substantial due to its direct effect on data integrity and confidentiality, as reflected by the CVSS 3.1 Base Score of 5.4. The vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N) confirms that while availability is not directly impacted, both confidentiality and integrity are compromised at a low level. Unauthorized read access allows attackers to exfiltrate sensitive business intelligence reports, customer data, or financial metrics stored within the BI Publisher repository. Simultaneously, unauthorized write capabilities enable an attacker to alter historical records, inject false analytics, or delete critical datasets. This dual impact can lead to severe decision-making errors for stakeholders relying on accurate reporting and may violate regulatory compliance requirements such as GDPR or HIPAA depending on the nature of the exposed data. In terms of adversary behavior, this vulnerability maps to ATT&CK technique T1078, Valid Accounts, where attackers use legitimate credentials with insufficient privileges to gain a foothold, followed by techniques like T1565 for Data Manipulation and T1005 for Data from Local System.
Mitigation strategies must focus on immediate patching and access control hardening. Oracle should be consulted for the latest security patches that address this specific flaw in BI Publisher Security. Organizations running affected versions 8.2.0.0.0, 12.2.1.4.0, or 26.01.0.0 must prioritize applying these updates to close the privilege escalation gap. In addition to patching, it is critical to review and restrict network access to BI Publisher services. These services should not be exposed directly over HTTP; instead, they should be placed behind a reverse proxy that enforces HTTPS with strong certificate validation to prevent eavesdropping and man-in-the-middle attacks. Access controls must be reviewed to ensure the principle of least privilege is strictly enforced, ensuring that low-privileged users cannot interact with administrative endpoints or data modification APIs. Regular auditing of user activities within BI Publisher can also help detect anomalous behavior indicative of exploitation attempts before significant damage occurs.