CVE-2021-39226
Grafana Authentication Bypass Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 15 September 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 7.3 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- EPSS
- 99.93% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 25 August 2022 · due 15 September 2022
- Weakness
- CWE-287, CWE-862
- Affected
- grafana/grafana · fedoraproject/fedora
- Source
- security-advisories@github.com
EPSS 99.9% since 30 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. https://grafana.com/blog/2021/10/05/grafana-7.5.11-and-8.1.6-released-with-critical-security-fix/; https://nvd.nist.gov/vuln/detail/CVE-2021-39226
References
- http://www.openwall.com/lists/oss-security/2021/10/05/4Mailing List, Third Party Advisory
- https://github.com/grafana/grafana/commit/2d456a6375855364d098ede379438bf7f0667269Patch
- https://github.com/grafana/grafana/security/advisories/GHSA-69j6-29vr-p3j9Exploit, 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
- http://www.openwall.com/lists/oss-security/2021/10/05/4Mailing List, Third Party Advisory
- https://github.com/grafana/grafana/commit/2d456a6375855364d098ede379438bf7f0667269Patch
- https://github.com/grafana/grafana/security/advisories/GHSA-69j6-29vr-p3j9Exploit, 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-2021-39226US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.