Description

Relative path traversal in Microsoft Fabric allows an authorized attacker to elevate privileges over a network.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.9",
  "pubDate": "2026-08-20T22:17:46.963Z",
  "pubdate": "2026-08-20T22:17:46.963Z",
  "executiveSummary": "This vulnerability involves a relative path traversal flaw affecting Microsoft Fabric, which can be exploited by an authorized attacker to achieve privilege escalation over a network.\nThe security defect stems from improper validation of file paths and input parameters within the application logic, allowing malicious actors to traverse directory structures outside the intended operational scope.\nThe primary impact of successful exploitation includes unauthorized privilege escalation, potentially granting the attacker elevated access rights and administrative capabilities within the affected environment.\nThe vulnerability targets Microsoft Fabric deployments and represents a significant risk to organizational data integrity and confidentiality.\nPrerequisites for exploitation require the attacker to possess authorized access to the network and platform, after which they can leverage crafted requests to manipulate file path resolutions.\nGiven the nature of relative path traversal flaws, the attack vector involves exploiting insufficient sanitization mechanisms to access unauthorized system resources or sensitive configuration files.\nOrganizations utilizing Microsoft Fabric must apply appropriate security updates and hardening measures to prevent unauthorized privilege elevation and mitigate potential network-based exploitation vectors.",
  "technicalDetails": "The vulnerability is a relative path traversal flaw residing within Microsoft Fabric, specifically stemming from inadequate sanitization and validation of user-supplied input utilized in file system operations or internal routing mechanisms.\nThe root cause involves the application accepting relative path sequences, such as directory traversal tokens, without properly restricting input to designated secure directories.\nExploitation occurs over a network vector and requires the attacker to be an authorized user of the system.\nBy submitting maliciously crafted payloads containing traversal sequences, the attacker manipulates how the application resolves file paths, bypassing intended security boundaries.\nDuring the attack flow, the attacker sends a specially crafted request containing relative path specifiers to the vulnerable component of Microsoft Fabric.\nThe application processes the unsanitized input, inadvertently granting access to restricted directories or executing unauthorized functions that rely on file system interactions.\nThis unauthorized access to sensitive internal components or configuration files enables the attacker to escalate their privileges within the application context.\nThe privilege escalation capability allows the attacker to transition from a standard authorized user to an elevated privilege level, potentially compromising the overall security posture of the affected Microsoft Fabric instance.\nNetwork exposure is inherent to the service architecture, allowing remote exploitation by any user with valid authentication credentials.\nPost-exploitation impact includes unauthorized administrative control, potential data exfiltration, and manipulation of platform resources due to the elevated access achieved through the traversal flaw."
}