CVE-2026-21725

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.

CVSS Metrics

• v3.1•LOW•Score: 2.6CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
• v3.1•LOW•Score: 2CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N

EPSS Trends

Current EPSS score: 0.16%• Percentile: 6%

Techniques & Countermeasures

• CWE-367•Time-of-check Time-of-use (TOCTOU) Race Condition

  The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.

Affected Systems

• chainguard•grafana-11.4

  all

• chainguard•grafana-11.5

  all

• chainguard•grafana-11.6

  all

• chainguard•grafana-12.0

  all

• chainguard•grafana-12.1

  all

• chainguard•grafana-12.2

  all

• chainguard•grafana-12.3

  all

• chainguard•grafana-12.4

  < 12.4.1-r0

• wolfi•grafana-12.3

  all

• wolfi•grafana-12.4

  < 12.4.1-r0

• grafana•grafana

  ≥ 11.0.0, < 12.4.1 | ≥ v11.0.0, < v12.4.1

References (3)

• https://grafana.com/security/security-advisories/cve-2026-21725
• https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21725.json
• https://nvd.nist.gov/vuln/detail/CVE-2026-21725