Auth bypass in Grafana
CVE-2026-21721
The dashboard permissions API does not verify the target dashboard scope and only checks the dashboards.permissions:* action. As a result, a user who has permission management rights on one dashboard can read and modify permissions on other dashboards. This is an organization‑internal privilege escalation.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.007 (52.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.001
Affected products
- Grafana — versions 11.6.9, 12.0.8, 12.1.5
- Grafana Grafana/grafana — versions 12.3.0, 12.2.0, 12.1.0
- Grafana Grafana/grafana-Enterprise — versions 10.2.0, 12.0.0, 12.1.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- grafana.com/security/security-advisories/cve-2026-21721 (vendor-advisory, Vendor Advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-21721?
- CVE-2026-21721 is a high-severity vulnerability in Grafana, classified under Incorrect Authorization. CVSS score: 8.1/10. Published 2026-01-27.
- How severe is CVE-2026-21721?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2026-21721 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.