Vulnerability in grafana (CVE-2026-21723)
Summary
Vulnerability in grafana (CVE-2026-21723). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 11.6.11, 12.0.10, 12.1.7, 12.2.5, 12.3.3 or later.
Original description
The description as published by the source.
The alertmanager templates test endpoint (/api/alertmanager/grafana/config/api/v1/templates/test) can execute templates with no memory limits. Mass-executing templates in a short period causes OOM and crashes the Grafana service. The endpoint requires very low privileges and is exploitable with anonymous access enabled.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-21723 has been found in grafana.
Risk of unauthorized operations or information disclosure. CVSS score: 5.3/10.
What to do: upgrade grafana to 11.6.11, 12.0.10, 12.1.7, 12.2.5, 12.3.3 or later.
If unsure, ask your IT team or search "grafana CVE-2026-21723" on the vendor's site.
CVE-2026-21723 (grafana) — CWE-400 / CVSS v3 5.3
Attack vector: remote (network-reachable) / no user interaction
Patched: 11.6.11, 12.0.10, 12.1.7, 12.2.5, 12.3.3 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-400) exists in grafana.
Check the vendor advisory for the affected versions of grafana.
Severity: Medium (CVSS 5.3/10). Risk of unauthorized operations or information disclosure.
Update to 11.6.11, 12.0.10, 12.1.7, 12.2.5, 12.3.3.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'grafana' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'grafana' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
grafanaを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade grafana to 11.6.11, 12.0.10, 12.1.7, 12.2.5, 12.3.3ステージング環境で 11.6.11, 12.0.10, 12.1.7, 12.2.5, 12.3.3 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- web nvd.nist.gov
- web grafana.com
- web github.com