CVE-2021-39226: Grafana Authentication Bypass Vulnerability

Q: How do I fix CVE-2021-39226?

grafana: upgrade to 7.5.11, 8.1.6; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2021-39226 being exploited?

Yes. CVE-2021-39226 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

Q: What does CVE-2021-39226 affect?

CVE-2021-39226 affects grafana, fedora. Severity is critical (CVSS 9.8). 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

Q: How urgent is CVE-2021-39226?

Priority 97/100. Critical severity; EPSS top 1%: very likely to be exploited; Exploited in the wild (CISA KEV); Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Patch now

CRITICAL 9.8EXPLOITEDREMOTEUPGRADEMITIGATE

CVE-2021-39226 is a critical-severity flaw (CVSS 9.8) affecting grafana, fedora, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 lit

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Exploited in the wild (CISA KEV)
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	99.9% (top 1%)
CISA exploited list	Yes, fix due 2022-09-15
Weakness	CWE-287, CWE-862
Published	2021-10-05
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: fedoraproject · grafana

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-10-05 18:15 UTCPublished CVE record published
2022-08-25Exploited Added to the CISA Known Exploited Vulnerabilities list
2022-09-15Deadline CISA due date for US federal agencies to patch
2026-06-17 04:03 UTCUpdated Record last modified

grafana grafana UPGRADE

Affected: < 7.5.11 · >= 8.0.0 and < 8.1.6

Fixed in: 7.5.11, 8.1.6

Safe to downgrade to: a release before 8.0.0

1. Check installed version

apt-cache policy grafana || rpm -q grafana || grafana --version

2. UPGRADE to 7.5.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade grafana

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade grafana

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 8.0.0 (Debian / Ubuntu)

apt-cache madison grafana sudo apt install grafana=<VERSION_BEFORE_8.0.0> sudo apt-mark hold grafana

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list grafana sudo dnf downgrade grafana-<VERSION_BEFORE_8.0.0> sudo dnf versionlock add grafana

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

fedoraproject fedora MITIGATE

Affected: 34 · 35

Fixed in: no fixed release known

Safe to downgrade to: a release before 34

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Go · github.com/grafana/grafana · FIXED · 7.5.11 · vulnerable: < 7.5.11 · source

go get github.com/grafana/grafana@v7.5.11 go list -m github.com/grafana/grafana

Fedora 46 · bitcoin-core-selinux · FIXED · 0.3-2.fc46 · FEDORA-2026-51fc806272 · source

sudo dnf upgrade --advisory=FEDORA-2026-51fc806272

Fedora ELN · guestfs-tools · FIXED · 1.57.5-1.eln159 · FEDORA-2026-9577c5ec16 · source

sudo dnf upgrade --advisory=FEDORA-2026-9577c5ec16

RHEL 8 · grafana · FIXED · grafana-7.3.6-3.el8_4

sudo dnf upgrade --advisory=RHSA-2021:3771 rpm -q grafana

RHEL 8.1 Extended Update Support · grafana · FIXED · grafana-6.2.2-7.el8_1

sudo dnf upgrade --advisory=RHSA-2021:3769 rpm -q grafana

RHEL 8.2 Extended Update Support · grafana · FIXED · grafana-6.3.6-3.el8_2

sudo dnf upgrade --advisory=RHSA-2021:3770 rpm -q grafana

RHEL 9 · grafana · NOT AFFECTED

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: Grafana Snapshot - Authentication Bypass

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-39226?

grafana: upgrade to 7.5.11, 8.1.6; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-39226 being exploited?

Yes. CVE-2021-39226 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2021-39226 affect?

CVE-2021-39226 affects grafana, fedora. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2021-39226?

Priority 97/100. Critical severity; EPSS top 1%: very likely to be exploited; Exploited in the wild (CISA KEV); Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

Grafana vulnerabilities

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References

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