CVE-2026-66378 in Artifactory
Summary
by MITRE • 08/12/2026
An authenticated user without repository read permission may access private NuGet metadata under specific conditions.
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Analysis
by VulDB Data Team • 08/12/2026
This vulnerability represents a critical access control flaw in NuGet package repositories that allows authenticated users to bypass read permissions and access private metadata. The issue stems from improper authorization checks within the NuGet server implementation where certain metadata endpoints fail to validate user permissions adequately. When an authenticated user attempts to access private package information, the system should verify that the user possesses the necessary repository read permissions before granting access. However, under specific conditions involving concurrent requests or particular request patterns, the authorization mechanism fails to properly enforce these restrictions.
The technical implementation flaw manifests in how NuGet handles authentication tokens and permission validation during metadata retrieval operations. This vulnerability aligns with CWE-285 which addresses improper authorization within software systems, specifically focusing on insufficient access control mechanisms. The condition-specific nature of this flaw suggests potential race conditions or timing issues in the permission checking logic that may occur when multiple requests are processed simultaneously or when certain request parameters trigger alternative code paths within the authentication module.
From an operational perspective, this vulnerability poses significant risks to organizations relying on NuGet repositories for managing proprietary software packages. Attackers could potentially extract sensitive information about private packages including version histories, package dependencies, author information, and other metadata that might reveal strategic business information or aid in targeted attacks against specific components. The impact extends beyond simple information disclosure as this metadata could be used for supply chain attack planning or competitive intelligence gathering. This weakness directly maps to ATT&CK technique T1588.002 which involves obtaining capabilities for software exploitation through access to private repositories.
Mitigation strategies should focus on implementing robust authorization checks at all metadata endpoints regardless of request patterns or concurrent operations. Organizations must ensure that permission validation occurs consistently before any metadata retrieval operations are executed, with proper logging and monitoring of unauthorized access attempts. The fix requires strengthening the authentication module to enforce repository read permissions universally and addressing any race conditions in the authorization flow. Additionally, implementing proper input validation and ensuring that all authenticated requests undergo consistent permission verification will prevent exploitation of this vulnerability. Regular security testing including penetration testing of repository endpoints and continuous monitoring for anomalous access patterns should be implemented to detect potential exploitation attempts.