CVE-2026-65811 in Power BI Report Server
Summary
by MITRE • 08/12/2026
Improper input validation in Power BI allows an authorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 08/12/2026
This vulnerability represents a critical security flaw in Microsoft Power BI that stems from inadequate input validation mechanisms within the application's processing pipeline. The weakness occurs when Power BI fails to properly sanitize or validate user-supplied data inputs before processing them, creating an opportunity for malicious actors with authorized access to exploit this gap through crafted inputs that can trigger unintended code execution behaviors. Such vulnerabilities fall under the broader category of injection flaws as defined by CWE-74 and are particularly dangerous in enterprise environments where Power BI is commonly used for data analysis and reporting.
The technical implementation of this vulnerability typically manifests when Power BI processes external data sources or user-generated content without sufficient validation checks on the input parameters. An attacker with legitimate access to the Power BI environment can manipulate data feeds, report parameters, or dataset configurations to inject malicious code that executes within the application's runtime context. This exploitation vector leverages the trust relationship between the authenticated user and the system, making detection more challenging as the malicious activity appears to originate from a legitimate source. The underlying architecture of Power BI, which processes various data formats including csv, json, xml, and database connections, creates multiple potential entry points where this validation failure can be exploited.
The operational impact of such a vulnerability extends beyond simple code execution, potentially allowing attackers to escalate privileges, access sensitive data, or establish persistent backdoors within the organizational network. In enterprise settings where Power BI serves as a central analytics platform, successful exploitation could compromise entire data ecosystems and provide attackers with insights into business operations, financial data, and strategic information. The vulnerability's severity is amplified by the fact that it requires only authorized access, meaning that insider threats or compromised accounts can leverage this flaw to cause significant damage without needing to bypass initial authentication mechanisms. This aligns with ATT&CK technique T1059 which covers command and scripting interpreter execution, where an attacker could use this vulnerability to gain a foothold within the environment.
Mitigation strategies should focus on implementing robust input validation controls at multiple layers of the Power BI architecture including data source validation, parameter sanitization, and runtime monitoring. Organizations should enforce strict data governance policies that limit user permissions when processing external data sources and implement network segmentation to contain potential exploitation attempts. Regular security assessments and penetration testing specifically targeting Power BI configurations can help identify similar validation gaps before they can be exploited. Microsoft has historically addressed such vulnerabilities through regular security updates and patches, though organizations must maintain vigilance in applying these fixes promptly while also implementing additional defensive measures like application whitelisting and behavioral monitoring to detect anomalous code execution patterns that may indicate exploitation attempts.