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CVE-2021-39226 CISA KEV high

[KEV] Authentication Bypass in Grafana labs github.com/grafana/grafana (CVE-2021-39226)

Summary

Authentication bypass in Grafana labs github.com/grafana/grafana (CVE-2021-39226). Risk of unauthorized operations or information disclosure. Listed in CISA KEV — actively exploited. Mitigation: upgrade to 8.1.6 or later.

Original description

The description as published by the 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.

Source: CISA Known Exploited Vulnerabilities NVD GitHub Advisory CISA KEV

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-2021-39226 has been found in Grafana labs github.com/grafana/grafana.
Risk of unauthorized operations or information disclosure.
Note: CISA has officially confirmed this is actively exploited in the wild. Treat it with elevated urgency.
What to do: upgrade Grafana labs github.com/grafana/grafana to 8.1.6 or later.
If unsure, ask your IT team or search "Grafana labs github.com/grafana/grafana CVE-2021-39226" on the vendor's site.

CVE-2021-39226 (Grafana labs github.com/grafana/grafana) — CWE-287
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 8.1.6 — apply immediately
Listed in CISA KEV — actively exploited, treat as top priority.
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.

❓ What is the problem

Authentication bypass (CWE-287) exists in Grafana labs github.com/grafana/grafana.

📍 Affected scope

Check the vendor advisory for the affected versions of Grafana labs github.com/grafana/grafana.

🔥 Severity

Severity: High. Risk of unauthorized operations or information disclosure. Listed in CISA KEV — actively exploited in the wild, treat as top priority.

🔧 How to fix

Update to 8.1.6.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'github.com/grafana/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

  1. 1
    Identify exposure identify 
    grep -r 'github.com/grafana/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 github.com/grafana/grafana を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Consider incident declaration escalate 
    Notify SOC / on-call

    CISA KEV登録済 = 実環境で悪用が観測されている。侵入の兆候があればインシデント対応宣言、無くてもパッチ適用までWAF強化を最優先で。

  3. 3
    Apply patch patch 
    Upgrade Grafana labs github.com/grafana/grafana to 8.1.6

    ステージング環境で 8.1.6 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。

  4. 4
    Post-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

Go github.com/grafana/grafana
[{"type":"SEMVER","events":[{"introduced":"8.0.0"},{"fixed":"8.1.6"}]}]
Bitnami grafana
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"7.5.11"},{"introduced":"8.0.0"},{"fixed":"8.1.6"}]}]

References

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