Actively exploited in the wild
Grafana Authentication Bypass Vulnerability
Grafana Labs - Grafana · Listed in the CISA KEV since 2022-08-25. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2021-39226
CriticalCVSS 9.8KEVSummary
Grafana has a vulnerability that allows unauthenticated and authenticated users to view snapshots with the lowest database key by accessing specific paths. If the public_mode setting is enabled, unauthenticated users can also delete such snapshots. Authenticated users can delete snapshots regardless of this setting, leading to complete snapshot data loss.
Risk Assessment
The risk includes unauthorized access to snapshot data and its complete deletion, which can compromise the integrity and availability of visualization data in the organization.
Recommendation
It is recommended to upgrade immediately to version 8.1.6 or 7.5.11. If upgrading is not possible, block access to the specified paths using a reverse proxy or similar mechanism.
Other vulnerabilities in Grafana
See all- CVE-2026-28381Critical
The Snowflake datasource vulnerability allows GET/PUT commands, enabling any user with query access to read/write files between the local Grafana server and the connected Snowflake host.
- CVE-2026-27876Critical
A chained attack via SQL Expressions and a Grafana Enterprise plugin can lead to remote arbitrary code execution (RCE). The vulnerability requires the sqlExpressions feature toggle to be enabled and affects specific Grafana OSS versions.
- CVE-2025-41115Critical
In Grafana versions 12.x where SCIM provisioning is enabled and configured, a vulnerability in user identity handling allows a malicious or compromised SCIM client to provision a user with a numeric externalId, which could allow overriding internal user IDs and lead to impersonation or privilege escalation.
- CVE-2023-3128Critical
Grafana validates Azure AD accounts based on the email claim. The email field in Azure AD profiles is not unique and can be easily modified, leading to account takeover and authentication bypass when Azure AD OAuth is configured with a multi-tenant app.
- CVE-2021-43798HighActively exploited
Grafana versions 8.0.0-beta1 through 8.3.0 (except for patched versions) is vulnerable to directory traversal, allowing access to local files. The vulnerable URL path is: `<grafana_host_url>/public/plugins//`, where is the plugin ID for any installed plugin. Grafana Cloud has never been vulnerable.
- CVE-2026-15815High
Grafana OSS and Grafana Enterprise did not safely resolve symbolic links when extracting plugin archives. A crafted archive can chain relative symlinks to escape the plugin installation directory, writing arbitrary files and an executable backend binary outside it, which then runs with Grafana server privileges.
- CVE-2026-19475Medium
An authenticated user with permission to query a SQL data source can bypass the fix for CVE-2026-33375 by injecting the timeGroup macro through a WHERE clause, which Grafana's regex-based macro parsing does not reject. Evaluating the injected macro causes uncontrolled memory consumption that can terminate the Grafana server process, resulting in a denial of service. The Microsoft SQL Server, PostgreSQL, and MySQL data sources are affected.
- CVE-2026-14199High
A vulnerability in Grafana (only self-managed instances with Auth Proxy authentication and identity caching enabled) where the Auth Proxy cache key concatenates username and forwarded identity attributes without a delimiter, allowing distinct identities to collide. An authenticated user can spoof a higher-privileged user.
- CVE-2026-19197Medium
A user with organization administrator permissions can delete dashboard snapshots belonging to other organizations on the same Grafana instance, and can recover a snapshot's secret delete key using only its public share key (broken access control).
- CVE-2026-17033Medium
An authenticated attacker with Editor access or alert.instances.external:write can submit an external Alertmanager alert containing a controlled generatorURL. Grafana renders alert.generatorURL directly as the Alert Details See source LinkButton href without URL-scheme sanitization or a safe-protocol allowlist. The click interceptor's :// heuristic can be bypassed by placing :// inside a JavaScript comment. When a user with read access clicks See source, the browser executes attacker-controlled JavaScript in the Grafana origin with the clicking user's permissions.
Original NVD description (English source)
Grafana is an open source data visualization platform. In affected versions unauthenticated and authenticated users are able to view the snapshot with the lowest database key by accessing the literal paths: /dashboard/snapshot/:key, or /api/snapshots/:key. If the snapshot "public_mode" configuration setting is set to true (vs default of false), unauthenticated users are able to delete the snapshot with the lowest database key by accessing the literal path: /api/snapshots-delete/:deleteKey. Regardless of the snapshot "public_mode" setting, authenticated users are able to delete the snapshot with the lowest database key by accessing the literal paths: /api/snapshots/:key, or /api/snapshots-delete/:deleteKey. The combination of deletion and viewing enables a complete walk through all snapshot data while resulting in complete snapshot data loss. This issue has been resolved in versions 8.1.6 and 7.5.11. If for some reason you cannot upgrade you can use a reverse proxy or similar to block access to the literal paths: /api/snapshots/:key, /api/snapshots-delete/:deleteKey, /dashboard/snapshot/:key, and /api/snapshots/:key. They have no normal function and can be disabled without side effects.