CVE-2026-21725
Authorization Bypass via TOCTOU in Grafana Datasource Deletion by Name
Description
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.
How to fix CVE-2026-21725
To remediate CVE-2026-21725, upgrade the affected package to a fixed version below.
- —upgrade to 12.4.1 or later
Is CVE-2026-21725 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 11.0.0, < 12.4.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW2.0 | CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N |