CVE-2026-28377

HIGH

S3 SSE-C Encryption Key Exposed in Plaintext via Config Endpoint (CVE-2025-41118 Pattern)

Title source: cna

Description

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.

References (1)

[Vendor Advisory] https://grafana.com/security/security-advisories/cve-2026-28377

Scores

CVSS v3 7.5

EPSS 0.0001

EPSS Percentile 0.7%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-326

Status published

Products (2)

grafana/tempo < 2.10.3

Grafana/Tempo 2.10.3

Published Mar 26, 2026

Tracked Since Mar 27, 2026