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Fencer Vulns
low 2.6

CVE-2026-21725 json

Authorization Bypass via TOCTOU in Grafana Datasource Deletion by Name

published 2026-02-25 8 mo ago modified 2026-09-08 2 mo ago also BIT-grafana-2026-21725 , EUVD-2026-8637

cvss
2.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 8%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami grafana 12.4.1
  • Grafana Grafana v12.4.1
  • grafana SLE Module for Package Hub 15 SP7 12.4.5-150200.3.91.1
  • grafana Multi Linux Manager Tools SLE-15 11.6.14+security01-150002.4.14.1
  • spacecmd Multi Linux Manager Tools SLE-15 5.1.13-150002.3.9.3
  • uyuni-tools Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 5.1.26-150002.3.12.1
  • prometheus-blackbox_exporter Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 0.26.0-150002.3.6.1
  • golang-github-prometheus-prometheus Multi Linux Manager Tools SLE-15 3.5.0-150002.3.8.1
  • golang-github-lusitaniae-apache_exporter Multi Linux Manager Tools SLE-15 1.0.10-150002.3.6.1

suse advisories SUSE-SU-2026:3718-1SUSE-SU-2026:1524-1

  • grafana openSUSE Leap 16.0 12.4.5-bp160.1.1
  • grafana openSUSE Leap 16.0 11.6.14+security04-bp160.1.1
  • grafana openSUSE Tumbleweed 11.6.14+security01-1.1

opensuse advisories openSUSE-SU-2026:21351-1openSUSE-SU-2026:20940-1openSUSE-SU-2026:10601-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-21725 updated cvss 2.6

grafana: Grafana: Unauthorized data source deletion via time-of-create-to-time-of-use (TOCTOU) vulnerability

  • Red Hat Ceph Storage 7 rhceph/grafana-rhel9 Red Hat Ceph Storage 8 rhceph/grafana-rhel9 Red Hat Enterprise Linux 8 grafana, grafana-loki, grafana-mssql, grafana-mysql, grafana-selinux, grafana-graphite, +8 more Red Hat Enterprise Linux 9 grafana, grafana-selinux Red Hat Enterprise Linux 10 grafana
    affected: no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
8 mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 2.6 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
NVD 3.1 2.0 CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N
OSV 3.1 2.0 CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
bitnami grafana
>=11.0.0, <12.4.1
12.4.1

Affected products

  • Grafana Grafana

Classification

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

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.