Vulnerability in Grafana
CVE-2026-21725
A time-of-create-to-time-of-use (TOCTOU) vulnerability lets recently deleted-then-recreated data sources be re-deleted without permission to do so. This requires several very stringent conditions to be met: - The attacker must have admin access to the specific datasource prior to its first deletion. - Upon deletion, all steps within the attack must happen within the next 30 seconds and on the same pod of Grafana. - The attacker must delete the datasource, then someone must recreate it. - The new datasource must not have the attacker as an admin. - The new datasource must have the same UID as the prior datasource. These are randomised by default. - The datasource can now be re-deleted by the attacker. - Once 30 seconds are up, the attack is spent and cannot be repeated. - No datasource with any other UID can be attacked.
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 2.6 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.002 (5.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 5.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Grafana — versions v11.0.0
Weakness classification (CWE)
References
- grafana.com/security/security-advisories/cve-2026-21725 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-21725?
- CVE-2026-21725 is a low-severity vulnerability in Grafana, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 2.6/10. Published 2026-02-25.
- How severe is CVE-2026-21725?
- Low severity. CVSS v3 base score is 2.6 out of 10.