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CVE-2026-28377

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

Published: Mar 26, 2026Updated: Jun 17, 2026 Sources: CVE List NVD BDUCWE-326
7.5HIGH
NVD MITRE
EPSS Score
0.2%
Top 94.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-326

Affected Products

Grafana
oss-project·US
TempoOn-premWeb App
Enterprise Software / itsm-monitoring
Grafana Labs
commercial·US
Grafana TempoOn-premWeb App
Enterprise Software / itsm-monitoring
and 1 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-28377?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Credential Access
View detailed technique mapping

References

https://grafana.com/security/security-advisories/cve-2026-28377
grafana.com
https://grafana.com/security/security-advisories/cve-2026-28377/
grafana.com

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