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CVE-2026-28377— S3 SSE-C Encryption Key Exposed in Plaintext via Config Endpoint (CVE-2025-41118 Pattern)

Quick assessment

Affected
Grafana Tempo
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Grafana Tempo是Grafana开源的一个分布式追踪数据存储与查询系统。 Grafana Tempo存在安全漏洞，该漏洞源于/status/config端点以明文形式暴露S3 SSE-C加密密钥，可能导致未经授权的用户获取用于加密跟踪数据的密钥。

CVSS 7.5 · High EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
Grafana Tempo 2.10.3 affected
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I. Basic Information for CVE-2026-28377

Vulnerability Information
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Vulnerability Title
S3 SSE-C Encryption Key Exposed in Plaintext via Config Endpoint (CVE-2025-41118 Pattern)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Grafana Tempo 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grafana Tempo是Grafana开源的一个分布式追踪数据存储与查询系统。 Grafana Tempo存在安全漏洞，该漏洞源于/status/config端点以明文形式暴露S3 SSE-C加密密钥，可能导致未经授权的用户获取用于加密跟踪数据的密钥。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Grafana Tempo 2.10.3 -

II. Public POCs for CVE-2026-28377

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III. Intelligence Information for CVE-2026-28377

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Vendor Advisories for CVE-2026-28377 (1)

Same Patch Batch · Grafana · 2026-03-26 · 3 CVEs total

CVE-2026-33375 6.5 MEDIUM Grafana MSSQL Data Source Plugin: Restriction Bypass Leading to OOM DoS
CVE-2026-21724 5.4 MEDIUM Missing Protected-field Authorization in Provisioning Contact Points API

IV. Related Vulnerabilities

Same product: Tempo
Same vendor: Grafana

V. Comments for CVE-2026-28377

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