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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-21727)

The AlmaLinux 9.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1789289678 advisory.

  - 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. (CVE-2026-21727)

  - During chain building, the amount of work that is done is not correctly limited when a large number of     intermediate certificates are passed in VerifyOptions.Intermediates, which can lead to a denial of     service. This affects both direct users of crypto/x509 and users of crypto/tls. (CVE-2026-32280)

  - Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can     be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering.
    (CVE-2026-42502)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Rocky Linux 9.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1789289678 advisory.

  - 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. (CVE-2026-21727)

  - During chain building, the amount of work that is done is not correctly limited when a large number of     intermediate certificates are passed in VerifyOptions.Intermediates, which can lead to a denial of     service. This affects both direct users of crypto/x509 and users of crypto/tls. (CVE-2026-32280)

  - Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can     be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering.
    (CVE-2026-42502)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to its self-reported version, the Grafana install hosted on the remote host is prior to 12.0.9, or 12.1.x prior to 12.1.6, or 12.2.x prior to 12.2.4, or 12.3.x prior to 12.3.3. It is, therefore, affected by a cross-tenant legacy correlation disclosure and deletion vulnerability.

- 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.

Note that the scanner has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-21727)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
472996	SCA: security update for github.com/grafana/grafana (GHSA-p5x9-j974-rpfp)	Tenable Cloud Security	SCA Checks	Local	low
472996	SCA: security update for github.com/grafana/grafana (GHSA-p5x9-j974-rpfp)	Tenable Self-Hosted Container Security	SCA Checks	Local	low
361085	AlmaLinux 9.6 [TuxCare] Security Update: grafana / grafana-selinux Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1789289678)	Nessus	Alma Linux Local Security Checks	Local	medium
360966	Rocky Linux 9.6 [TuxCare] Security Update: grafana / grafana-selinux Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1789289678)	Nessus	Rocky Linux Local Security Checks	Local	medium
115189	Grafana 12.3.x < 12.3.3 Improper Authorization	Web App Scanning	Component Vulnerability	Version Based	low
115188	Grafana 12.2.x < 12.2.4 Improper Authorization	Web App Scanning	Component Vulnerability	Version Based	low
115187	Grafana 12.1.x < 12.1.6 Improper Authorization	Web App Scanning	Component Vulnerability	Version Based	low
115186	Grafana < 12.0.9 Improper Authorization	Web App Scanning	Component Vulnerability	Version Based	low
298330	Linux Distros Unpatched Vulnerability : CVE-2026-21727	Nessus	Misc.	Local	low

Detections

Analytics

CVE-2026-21727

low

Tenable Plugins

low

low

medium

medium

low

low

low

low

low