Full Report
Grafana security advisory (AV26-796)
Analysis Summary
# Vulnerability: Grafana MCP Server Improper Input Validation
## CVE Details
- **CVE ID:** CVE-2026-19516
- **CVSS Score:** Not yet finalized (Pending official NVD/Vendor scoring)
- **CWE:** CWE-20: Improper Input Validation (Commonly associated with MCP/Plugin interfaces)
## Affected Systems
- **Products:**
- Grafana MCP (Model Context Protocol) Server
- mcp-grafana
- **Versions:**
- Prior to or equal to version 1.0.0
- **Configurations:** Systems utilizing the Model Context Protocol (MCP) integration to interface Grafana with AI agents or LLM-based tools.
## Vulnerability Description
While specific technical details are emerging, CVE-2026-19516 relates to a security flaw within the Grafana MCP Server implementation. The vulnerability likely involves insufficient validation of inputs received via the Model Context Protocol. In such environments, this typically allows an attacker to manipulate queries or commands sent to the Grafana instance, potentially leading to unauthorized data access or unintended execution of server functions.
## Exploitation
- **Status:** PoC not currently public / No reports of exploitation in the wild.
- **Complexity:** Medium
- **Attack Vector:** Network (typically via the application interface or API)
## Impact
- **Confidentiality:** High (Potential unauthorized access to dashboard data and metrics)
- **Integrity:** Medium (Potential modification of dashboard configurations)
- **Availability:** Low
## Remediation
### Patches
Grafana Labs has addressed this issue in the latest releases. Users are advised to update their MCP components immediately:
- **Grafana MCP Server:** Update to versions > 1.0.0
- **mcp-grafana:** Update to versions > 1.0.0
### Workarounds
- Disable the MCP Server if it is not actively required for your operations.
- Implement strict IP allowlisting for any services communicating with the MCP interface.
- Ensure that the service account used by the MCP server has "Least Privilege" access within Grafana.
## Detection
- **Indicators of Compromise:** Unusual volume of queries originating from the MCP integration; logs showing unexpected API calls to the `/api/` endpoints associated with model context processing.
- **Detection methods:** Monitor Grafana audit logs for authentication anomalies or high-frequency metadata requests.
## References
- Grafana Security Tags: hxxps[://]grafana[.]com/tags/security/
- CVE-2026-19516 Record: hxxps[://]www[.]cve[.]org/CVERecord?id=CVE-2026-19516
- Canadian Centre for Cyber Security Advisory: hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/grafana-security-advisory-av26-796