CVEs / CVE-2021-39226

CVE-2021-39226: Grafana Authentication Bypass Vulnerability

• Known exploited in the CISA KEV catalog since 25 Aug 2022
• high 7.3 CVSS 3.1 (NVD)
• EPSS 99.9% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
• Last changed at its sources 20 Oct 2026

Summary

Grafana contains an authentication bypass vulnerability that allows authenticated and unauthenticated users to view and delete all snapshot data, potentially resulting in complete snapshot data loss.

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 and fixed versions

Package versions from GHSA-69j6-29vr-p3j9.

Exploitation

Severity

References

• CVE-2021-39226 on NVD
• CVE-2021-39226 in the CISA KEV catalog
• https://grafana.com/blog/2021/10/05/grafana-7.5.11-and-8.1.6-released-with-critical-security-fix/ (cited by CISA)
• CVE-2021-39226 on OSV
• http://www.openwall.com/lists/oss-security/2021/10/05/4 Mailing List, Third Party Advisory
• https://github.com/grafana/grafana/commit/2d456a6375855364d098ede379438bf7f0667269 Patch
• https://github.com/grafana/grafana/security/advisories/GHSA-69j6-29vr-p3j9 Exploit, Mitigation, Vendor Advisory
• https://grafana.com/docs/grafana/latest/release-notes/release-notes-7-5-11/ Release Notes
• https://grafana.com/docs/grafana/latest/release-notes/release-notes-8-1-6/ Release Notes
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DCKBFUSY6V4VU5AQUYWKISREZX5NLQJT/ Broken Link
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/E6ANHRDBXQT6TURLP2THM26ZPDINFBEG/ Broken Link
• https://security.netapp.com/advisory/ntap-20211029-0008/ Third Party Advisory
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39226 US Government Resource