What is CVE-2026-63087?

CVE-2026-63087 is a critical-severity vulnerability in Grafana-cold-storage Oncall, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-07-16.

How severe is CVE-2026-63087?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Grafana-cold-storage Oncall

CVE-2026-63087

Grafana OnCall through 1.16.11 contains an unauthenticated access vulnerability that allows remote attackers to obtain a valid PluginAuthToken by sending a POST request to the internal plugin install endpoint using hardcoded default stack_…

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Grafana-cold-storage Oncall — versions 0

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

disclosure@vulncheck.com (technical-description, exploit)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-63087?: CVE-2026-63087 is a critical-severity vulnerability in Grafana-cold-storage Oncall, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-07-16.
How severe is CVE-2026-63087?: Critical severity. CVSS v3 base score is 9.8 out of 10.