← Vulnerability feed

Vulnerability record · CVE-2026-28377 · published 26 March 2026

CVE-2026-28377: Grafana tempo inadequate encryption strength vulnerability

Grafana · Tempo

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.

7.5 CVSS 3.1 High EPSS 0.16% · top 95.0% CWE-326 · Inadequate encryption strength
7.5CVSS 3.1 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

Track CVE-2026-28377 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2026-21728Grafana tempo uncontrolled resource consumption vulnerabilityTempo queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment stra…EPSS 0.64%6.5CVE-2026-27878Grafana tempo uncontrolled resource consumption vulnerabilityA TraceQL query in Grafana Tempo with a large exemplars hint value can cause the Tempo instance to allocate an excessive amount of memory, resulting …EPSS 0.41%9.8CVE-2017-11317Telerik UI for ASP.NET AJAX weak encryption enables arbitrary file uploadTelerik.Web.UI in Progress Telerik UI for ASP.NET AJAX before R1 2017 and R2 before R2 2017 SP2 uses weak RadAsyncUpload encryption. Because the encr…KEVEPSS 84%analysed9.8CVE-2017-1000486PrimeFaces weak encryption flaw leads to remote code executionPrimeFaces 5.x uses inadequate encryption strength (CWE-326), which allows an unauthenticated remote attacker to reach code execution. The flaw is ra…KEVEPSS 94%analysed7.5CVE-2018-18325DNN (DotNetNuke) weak encryption of input parametersDNN (DotNetNuke) versions 9.2 through 9.2.2 use a weak encryption algorithm to protect input parameters, and the issue persists because the fix for C…KEVEPSS 74%analysed7.5CVE-2018-15811DNN (DotNetNuke) weak encryption of input parametersDNN (DotNetNuke) versions 9.2 through 9.2.1 use a weak encryption algorithm to protect input parameters. Because the protection is inadequate, data t…KEVEPSS 76%analysed

Source: NIST National Vulnerability Database (record CVE-2026-28377), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.