What’s Vulnerable › Vulnerabilities
CVE-2026-21725: Authorization Bypass via TOCTOU in Grafana Datasource Deletion by Name
- Severity: low (CVSS 2.0 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-02-25 · updated 2026-06-17
- Weakness: CWE-367
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.
Affected products
- Grafana: from 11.0.0 before 12.4.1 — fixed in 12.4.1
How to fix
Upgrade to a fixed version: Grafana 12.4.1. Check the vendor advisory for mitigations.
References
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