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A critical vulnerability tracked as CVE-2026-63087 affects Grafana OnCall through version 1.16.11, allowing unauthenticated attackers to obtain a valid PluginAuthToken from an internal plugin installation endpoint. The issue stems from hardcoded default stack_id and org_id values exposed in the public source tree, enabling a crafted POST request to bypass intended access controls. The flaw is classified as CWE-306 and carries a CVSS v3.1 rating of AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
With the stolen token, an attacker can reach internal API endpoints, create arbitrary Admin users through the user-context bootstrap path, revoke the legitimate plugin token, and alter the organization's grafana_url and api_token settings. Those changes can redirect OnCall-to-Grafana API traffic to an attacker-controlled host, turning the initial token theft into full administrative compromise and broad exposure of confidentiality, integrity, and availability.
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1 event from the most recent confirmed update back to the earliest known activity.
A new vulnerability, CVE-2026-63087, was added for Grafana OnCall affecting versions through 1.16.11. The issue allows unauthenticated attackers to obtain a valid PluginAuthToken via the internal plugin install endpoint using hardcoded default stack_id and org_id values exposed in the public source tree.
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Grafana issued urgent patches for two high-severity vulnerabilities, including **`CVE-2026-27876`**, a critical flaw in the SQL Expressions feature that can allow an attacker with **Viewer** privileges or higher to write arbitrary files to the server and potentially escalate to full **remote code execution**. The issue can be chained into broader compromise scenarios, including unauthorized SSH access, prompting public warnings from national defenders such as Belgium’s CCB to patch immediately. Grafana also fixed **`CVE-2026-27880`**, which affects OpenFeature validation endpoints and allows **unauthenticated** attackers to crash vulnerable instances by sending oversized requests that exhaust memory. Grafana Labs said patched releases, including **12.4.2**, are available and noted that **Amazon Managed Grafana** and **Azure Managed Grafana** were already protected under embargo; for temporary mitigation, administrators were advised to disable the `sqlExpressions` feature toggle and use highly available deployments and reverse proxies such as **Nginx** or **Cloudflare** to restrict request sizes.
Jun 29, 2026
Grafana patched **CVE-2026-19516**, a critical SSRF vulnerability with a CVSS score of 9.1 in the Grafana MCP server's `grafana_api_request` tool. The flaw allowed callers to control outbound HTTP requests through a supplied `X-Grafana-URL` header, potentially reaching internal services accessible from the MCP server and reading their responses. In tested deployments, the issue could expose sensitive data such as AWS IMDSv2 credentials. Researchers also found that attacker-generated values matching the expected session-ID format could bypass session validation and invoke MCP tools, including `tools/list` and `tools/call`, without authentication under the configured Grafana service account. Grafana addressed both issues in version 1.1.0 by fixing the SSRF condition and adding optional bearer-token authentication; operators should enforce authentication on remote MCP deployments, restrict service-account privileges, and apply strict outbound destination filtering.
Sep 4, 2026
A newly disclosed server-side request forgery flaw, **CVE-2026-19516**, affects **Grafana MCP Server** and **mcp-grafana** in versions **prior to or equal to `1.0.0`**. The vulnerability allows a caller-controlled `X-Grafana-URL` header to steer outbound requests to attacker-chosen destinations, while the `grafana_api_request` tool lets the caller select the HTTP method, path, and body. That combination can be abused to reach internal, loopback, and link-local services, including cloud metadata endpoints, and read back the responses. The issue remains exploitable despite an earlier fix for **CVE-2026-15583**, which prevented the configured Grafana service-account token from being sent to unintended destinations but did not restrict where requests could be sent. The **Canadian Centre for Cyber Security** issued advisory **AV26-796**, warning that Grafana products are affected and urging administrators to review vendor guidance and apply updates when available.
Aug 14, 2026