CVE-2026-21725 – Authorization Bypass via TOCTOU in Grafana Datasource Deletion by Name

CVE ID : CVE-2026-21725

Published : Feb. 25, 2026, 12:35 p.m. | 32 minutes ago

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.

Severity: 0.0 | NA

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