S3 SSE-C Encryption Key Exposed in Plaintext via Config Endpoint

High
Advisory ID:CVE-2026-28377
Published:2026-03-16
Product:Tempo
CVSS Score:7.5
CVSS Vector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Fixed Versions:
>=2.10.3

Summary

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.

Thanks to (william_goodfellow) for reporting this vulnerability.