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

> CVE-2026-28377: S3 SSE-C Encryption Key Exposed in Plaintext via Config Endpoint (CVE-2025-41118 Pattern). CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-28377
Last updated: 2026-08-27T17:22:34Z

- Published: 2026-03-26 21:39 UTC · Updated: 2026-08-27 17:22 UTC · Assigner: GRAFANA
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS: 0.16%, 5th percentile (scored 2026-10-25)
- CISA KEV: no

## 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 vendors and products

- Grafana: Tempo

## Tracked companies

- [Grafana Cloud](https://rewindex.com/company/grafana-cloud.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-28377)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-28377)
- [https://grafana.com/security/security-advisories/cve-2026-28377](https://grafana.com/security/security-advisories/cve-2026-28377)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-28377 · Markdown: https://rewindex.com/cve/CVE-2026-28377.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-28377 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T05:12:11.719Z