CVE-2021-39226 — Grafana Authentication Bypass Vulnerability
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.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- Confirmed exploitation (CISA KEV)+35
- Public exploit/PoC (nuclei)+4
- EPSS 99.9% (30-day exploitation probability)+15
- Technical severity (high)+6
- Automatable exploitation (SSVC)+3
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
CISA SSVC assessment CISA
Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented mitigation — github.com (NIST National Vulnerability Database)
- Go Github.com/grafana/grafana: fixed in version 7.5.11 — github.com (GitHub Security Advisories)
- Go Github.com/grafana/grafana: fixed in version 8.1.6 — github.com (GitHub Security Advisories)
CISA required action CISA
Apply updates per vendor instructions.
US federal deadline: Sep 15, 2022 — passed 1492 day(s) ago
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Fedoraproject Fedora, Grafana Grafana, Go Github.com/grafana/grafana).
- Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
- The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
- Apply the fixed version or the patch documented under Remediation.
- EPSS ahead of 100% of scored CVEs: prioritize it in the patch queue.
- Search available logs for exploit probes matching the vulnerability class (access control), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Fedoraproject | Fedora | version 34version 35 | Vulnerable | NIST National Vulnerability Database |
| Grafana | Grafana | < 7.5.11≥ 8.0.0 and < 8.1.6 | Vulnerable | NIST National Vulnerability Database |
| Grafana | Grafana | version >= 8.0.0, < 8.1.6version < 7.5.11 | Vulnerable | CVE Program (cve.org) e CISA ADP |
| Go | Github.com/grafana/grafana | < 7.5.11≥ 8.0.0 and < 8.1.6 | Vulnerable | GitHub Security Advisories |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 9.8 | CVSS 3.1 | Critical | 3.9 | 5.9 | security-advisories@github.com via NIST National Vulnerability Database |
| 9.8 | CVSS 3.1 | Critical | — | — | GitHub_M via CVE Program (cve.org) e CISA ADP |
| 7.3 | CVSS 3.1 | High | 3.9 | 3.4 | nvd@nist.gov via NIST National Vulnerability Database |
| 7.3 | CVSS 3.1 | High | — | — | GitHub, Inc. via GitHub Security Advisories |
| 6.8 | CVSS 2.0 | Medium | 8.6 | 6.4 | nvd@nist.gov via NIST National Vulnerability Database |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L (score shown at the top: nvd@nist.gov) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
CISA KEV details CISA
CISA lists a CVE once it has evidence of exploitation against real targets.
CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.
Public exploits, PoCs and detection templates
Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.
Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.
EPSS over time FIRST
Oct 13, 2026 → Oct 15, 2026 · 3 reading(s) · max 99.93%
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
- Audit administrative actions and access to resources outside each user’s normal pattern.
- Hunt retroactively in logs from before Aug 25, 2022 (KEV listing): exploitation may have started earlier.
Timeline
What happened to this CVE, newest first.
- 2026
- Fix documented
- Affected products added · go/github.com/grafana/grafana
- Affected products added · grafana/grafana
- SSVC assessment updated
- Record published
- Fix documented
- Affected products added · grafana/grafana, fedoraproject/fedora
- CVSS changed · 7.3
- Source status changed · → Analyzed
- Added to CISA KEV (detected)
- Record created in this database
- 2022
- Added to CISA KEV catalog
- 2021
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 2× References added · Oct 13, 2026 – Oct 13, 2026
- 1× Official description updated · Oct 13, 2026 – Oct 13, 2026
References
18 on the record
- github.com/grafana/grafana/security/advisories/GHSA-69j6-29vr-p3j9
- github.com/grafana/grafana/commit/2d456a6375855364d098ede379438bf7f0667269
- www.cisa.gov/known-exploited-vulnerabilities-catalog
- github.com/advisories/GHSA-69j6-29vr-p3j9
- grafana.com/docs/grafana/latest/release-notes/release-notes-8-1-6
- grafana.com/docs/grafana/latest/release-notes/release-notes-7-5-11
- security.netapp.com/advisory/ntap-20211029-0008/
- security.netapp.com/advisory/ntap-20211029-0008
- nvd.nist.gov/vuln/detail/CVE-2021-39226
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/E6AN
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/E6AN
- grafana.com/docs/grafana/latest/release-notes/release-notes-8-1-6/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DCKB
- www.openwall.com/lists/oss-security/2021/10/05/4
- grafana.com/docs/grafana/latest/release-notes/release-notes-7-5-11/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/E6ANHR
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DCKBFU
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DCKB
Elsewhere on this site
Related CVEs (same products)
- High CVE-2026-14199 Session takeover via Auth Proxy cache key collision Sep 2, 2026
- High CVE-2026-8609 Pre-authentication denial of service via the OAuth login route Jul 10, 2026
- Medium CVE-2026-8595 Stored XSS in the table panel (TableNG) Jul 10, 2026
- High CVE-2026-33382 Denial of service via unbounded request body size Jul 10, 2026
- Low CVE-2026-28378 Cross-Organization Public Dashboard Deletion via Missing Org Isolation Jul 7, 2026
- High CVE-2026-42127 Pre-authentication denial of service in the public dashboard query endpoint Jun 22, 2026
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2021-39226 is "Grafana Authentication Bypass Vulnerability", rated High. It affects Fedora (Fedoraproject); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 7.3 describes technical severity. EPSS 99.93% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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