CVE-2026-81841 in Grafana
Summary
by MITRE • 09/30/2026
Pausing a shared (public) dashboard did not revoke its access token for the endpoints that serve frontend bootstrap data. Anyone holding the link to a paused shared dashboard could still retrieve, without authenticating, the configuration of the dashboard's data sources, including stored credentials for data sources using browser access (missing authorization). Deleting the shared dashboard does revoke the token.
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Analysis
by VulDB Data Team • 09/30/2026
The vulnerability described constitutes a critical authentication bypass and information disclosure flaw within the platform's handling of shared public dashboards. Specifically, when an administrator or user pauses a shared dashboard that is configured for public access, the system fails to invalidate the associated access tokens used by frontend endpoints serving bootstrap data. This oversight creates a persistent security gap where previously generated tokens remain valid despite the intended restriction of access implied by the paused state. The core technical flaw lies in the lifecycle management of these authentication credentials; while deletion of the dashboard correctly triggers token revocation, pausing does not invoke the same cleanup procedures, leaving the endpoints accessible to anyone possessing the original link or token.
From a technical perspective, this issue represents a failure in enforcing access control policies during state transitions. The frontend bootstrap data often contains sensitive configuration details required for rendering the dashboard interface, including connection strings and credentials for underlying data sources when using browser-based authentication methods. Because these endpoints do not perform adequate authorization checks against the current status of the dashboard, an attacker or unauthorized user can exploit this by simply accessing the URL associated with the paused dashboard. The system continues to serve the bootstrap payload, effectively bypassing the intended security controls that should have restricted access upon pausing.
The operational impact of this vulnerability is severe due to the nature of the exposed data. Unauthorized parties can retrieve detailed configurations of the dashboard's connected data sources. This includes stored credentials for databases or APIs that rely on browser-based authentication mechanisms. Such exposure allows attackers to potentially gain direct, unauthenticated access to backend systems and sensitive datasets linked through these dashboards. The ability to extract configuration details without proper authorization undermines the confidentiality integrity of the entire platform, as it reveals internal architecture and valid credential sets that can be leveraged for further attacks such as data exfiltration or lateral movement within the network infrastructure.
This vulnerability aligns with CWE-287, which describes Improper Authentication, specifically in scenarios where authentication mechanisms are bypassed due to flawed state management logic. It also relates closely to CWE-200, Exposure of Sensitive Information to an Unauthorized Actor, as the primary consequence is the leakage of sensitive configuration data and credentials. In terms of threat modeling, this behavior facilitates unauthorized access without requiring complex exploitation techniques, relying instead on simple URL manipulation or reuse of existing links.
To mitigate this risk, immediate remediation should focus on ensuring that all state changes to shared resources trigger a comprehensive revocation of associated authentication tokens. The platform must enforce strict authorization checks at the API level for frontend bootstrap endpoints, verifying not only the validity of the token but also the current active status of the referenced dashboard resource. Implementing short-lived access tokens with automatic expiration can further reduce the window of exposure if such an oversight occurs in the future. Additionally, security audits should verify that all administrative actions affecting shared resources consistently update permission sets and invalidate cached credentials to prevent similar bypasses across other features.