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CVE-2026-28377

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

HIGH
7.5
CVSS Score
Published: March 26, 2026 at 09:39 PM UTC
Updated: June 17, 2026 at 01:20 PM UTC
1 product affected across 1 vendorTempo

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Severity
HIGH7.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Tempo· Grafanagrafana-plugin
95%
v < 2.10.32.10.3

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://grafana.com/security/security-advisories/cve-2026-28377

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHGRAFANA
Vector?

Quick Info

StatusANALYZED
CWE
CWE-326

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