CVE-2026-33376 Details
Description
When using an IPv6 allow-list for the Auth Proxy feature, it defaults to /32 addresses. Addresses specifying a mask explicitly are not affected; to mitigate easily, add the desired mask (usually /128) to the addresses. Only auth proxy is affected; Okta, SAML, LDAP, etc are unaffected here.
A vulnerability exists in Grafana's Auth Proxy feature when using an IPv6 allow-list, as it defaults to /32 addresses. This issue allows for potential misconfigurations, since only the Auth Proxy is affected; other authentication methods like Okta, SAML, and LDAP are not impacted. To address this vulnerability, users should specify the desired mask, typically /128, for the addresses in the allow-list.
Users can easily mitigate this vulnerability by adding the appropriate mask, usually /128, to the IPv6 addresses in the allow-list for the Auth Proxy feature.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 15, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://grafana.com/security/security-advisories/cve-2026-33376 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1188 | Initialization of a Resource with an Insecure Default | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| grafana grafana | >= 8.5.0, < 11.6.14 >= 12.2.0, < 12.2.8 >= 12.3.0, < 12.3.6 >= 12.4.0, < 12.4.3 11.6.14 - 11.6.14 security01 12.2.8 - 12.2.8 security01 12.3.6 - 12.3.6 security01 12.4.3 - 13.0.0 13.0.1 - |
CPE
Remediation
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Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 2, 2026 | Initial Analysis | [email protected] |
| May 14, 2026 | CVE Modified | CISA-ADP |
| May 13, 2026 | New CVE Received | [email protected] |