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CVE-2021-39226: Grafana Authentication Bypass Vulnerability

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2022-08-25
• EPSS: 99.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-10-05 · updated 2026-06-17
• Weakness: CWE-287

Description

Grafana is an open source data visualization platform. In affected versions unauthenticated and authenticated users are able to view the snapshot with the lowest database key by accessing the literal paths: /dashboard/snapshot/:key, or /api/snapshots/:key. If the snapshot "public_mode" configuration setting is set to true (vs default of false), unauthenticated users are able to delete the snapshot with the lowest database key by accessing the literal path: /api/snapshots-delete/:deleteKey. Regardless of the snapshot "public_mode" setting, authenticated users are able to delete the snapshot with the lowest database key by accessing the literal paths: /api/snapshots/:key, or /api/snapshots-delete/:deleteKey. The combination of deletion and viewing enables a complete walk through all snapshot data while resulting in complete snapshot data loss. This issue has been resolved in versions 8.1.6 and 7.5.11. If for some reason you cannot upgrade you can use a reverse proxy or similar to block access to the literal paths: /api/snapshots/:key, /api/snapshots-delete/:deleteKey, /dashboard/snapshot/:key, and /api/snapshots/:key. They have no normal function and can be disabled without side effects.

Affected products

• Fedoraproject Fedora: 34, 35
• Grafana: before 7.5.11; from 8.0.0 before 8.1.6 — fixed in 7.5.11, 8.1.6

How to fix

Upgrade to a fixed version: Grafana 7.5.11, 8.1.6. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2021/10/05/4
• https://github.com/grafana/grafana/commit/2d456a6375855364d098ede379438bf7f0667269
• https://github.com/grafana/grafana/security/advisories/GHSA-69j6-29vr-p3j9
• https://grafana.com/docs/grafana/latest/release-notes/release-notes-7-5-11/
• https://grafana.com/docs/grafana/latest/release-notes/release-notes-8-1-6/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DCKBFUSY6V4VU5AQUYWKISREZX5NLQJT/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/E6ANHRDBXQT6TURLP2THM26ZPDINFBEG/
• https://security.netapp.com/advisory/ntap-20211029-0008/
• http://www.openwall.com/lists/oss-security/2021/10/05/4
• https://github.com/grafana/grafana/commit/2d456a6375855364d098ede379438bf7f0667269
• https://github.com/grafana/grafana/security/advisories/GHSA-69j6-29vr-p3j9
• https://grafana.com/docs/grafana/latest/release-notes/release-notes-7-5-11/

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