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    CVE-2026-28377

    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.

    Published:Mar 26, 2026
    Last Modified:Apr 24, 2026
    EPS:Mar 26, 2026
    EPSS Score:0.00007
    CVSS Score:7.5

    Affected Products

    Vendor
    Grafana
    Product
    Tempo

    Exploits

    No exploit reference

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High