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CVE Record

CVE-2026-21727: Grafana Correlations: Cross-Tenant Data Disclosure and Permanent Deletion via Legacy org_id=0 Record

--- title: Cross-Tenant Legacy Correlation Disclosure and Deletion draft: false hero: image: /static/img/heros/hero-legal2.svg content: "# Cross-Tenant Legacy Correlation Disclosure and Deletion" date: 2026-01-29 product: Grafana severity: Low cve: CVE-2026-21727 cvss_score: "3.3" cvss_vector: "CVSS:3.3/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N" fixed_versions: - ">=11.6.11 >=12.0.9 >=12.1.6 >=12.2.4" --- A cross-tenant isolation vulnerability was found in Grafana’s Correlations feature affecting legacy correlation records. Due to a backward compatibility condition allowing org_id = 0 records to be returned across organizations, a user with datasource management privileges could read and permanently delete legacy correlation data belonging to another organization. This issue affects correlations created prior to Grafana 10.2 and is fixed in >=11.6.11, >=12.0.9, >=12.1.6, and >=12.2.4. Thanks to Gyu-hyeok Lee (g2h) for reporting this vulnerability.

LowCVSS 3.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

This is a low-severity Grafana Correlations issue where certain old correlation records could cross organization boundaries. A highly privileged datasource manager could read or permanently delete legacy correlation data from another organization. The issue is narrow, but deletion risk makes cleanup worthwhile for multi-tenant Grafana environments.

Executive priority

Treat this as a targeted maintenance item, not an emergency. Patch during the next appropriate Grafana maintenance window, with higher priority for multi-tenant environments that use Correlations.

Technical view

Grafana’s Correlations feature allowed backward-compatible org_id=0 legacy records to be returned across organizations. The advisory says users with datasource management privileges could read and permanently delete legacy correlations belonging to another organization. Fixed versions are >=11.6.11, >=12.0.9, >=12.1.6, and >=12.2.4.

Likely exposure

Exposure is most likely in Grafana deployments using Correlations with legacy correlation records created before Grafana 10.2, especially multi-organization instances with users holding datasource management privileges.

Exploitation context

No active exploitation is cited, and KEV is false. The CVSS vector requires network access, high attack complexity, and high privileges, with low confidentiality and integrity impact and no availability impact.

Researcher notes

Evidence is limited to the CVE data and Grafana advisory. The key condition is legacy org_id=0 correlation handling. Validate exposure by confirming version, Correlations usage, legacy record presence, and datasource-management privilege assignments.

Mitigation direction

  • Upgrade Grafana to a fixed version for your branch.
  • Review Grafana’s advisory for branch-specific upgrade guidance.
  • Limit datasource management privileges to trusted administrators.
  • Identify whether legacy pre-10.2 correlation records exist.
  • Prioritize multi-organization instances where correlations are used.

Validation and detection

  • Check current Grafana version against the fixed version list.
  • Inventory Correlations usage and legacy records created before Grafana 10.2.
  • Review users and roles with datasource management privileges.
  • Check for unexpected missing or cross-organization correlation data.
  • Document affected organizations and remediation status.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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cwe · medium confidence lookup

CWE-732: Authorization and privilege behavior lookup

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cve · low confidence lookup

CVE-2026-21727 mapping review

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Vulnerability profileCVE Program record
Severity
Low
CVSS
3.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
3Timeline events
1ADP providers
2Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
3.3CVSS 3.1LowCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N0.72.5GRAFANA

Vulnerability scoring details

Base CVSS 3.1 score

3.3Low
CVSS 3.1 vector shape for CVE-2026-21727Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
GrafanaGrafana Correlations10.2.0unaffected
Weakness

CWE details

CWE-732

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.