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Grafana published security advisories for two products, including CVE-2026-15583 in Grafana MCP Server and a separate unbounded memory allocation issue in Grafana Loki. The MCP Server flaw affects version 0.17.1 and earlier and stems from a confused-deputy SSRF condition triggered through the X-Grafana-URL header. An unauthenticated remote attacker can use the bug to exfiltrate the server’s environment-configured Grafana service-account token and force requests to arbitrary internal services.
The SSRF exposure also extends to sensitive internal targets such as cloud metadata endpoints, raising the risk of credential theft and internal network access without user interaction. Grafana’s Loki advisory covers version 3.7.0 and earlier, where detected_fields query limits can cause unbounded memory allocation. Government and security notices have urged administrators to review Grafana’s advisories and apply the vendor’s updates for affected MCP Server and Loki deployments.
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2 events from the most recent confirmed update back to the earliest known activity.
On 2026-07-15, Grafana published security advisories covering an SSRF issue in Grafana MCP Server and an unbounded memory allocation issue in Grafana Loki. The advisories identify affected versions as Grafana MCP Server 0.17.1 and earlier and Grafana Loki 3.7.0 and earlier.
The CVE entry states that CVE-2026-15583 was received by security@grafana.com on 2026-07-15. The flaw affects Grafana MCP Server up to and including version 0.17.1 and allows SSRF and exfiltration of the configured Grafana service-account token via a crafted X-Grafana-URL header.
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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
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