Auth Proxy IPv6 whitelist bypass

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Summary

CVECVE-2026-33376
StatePUBLISHED
AssignerGRAFANA
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-13 20:16:20 UTC
Updated2026-06-02 19:28:45 UTC
DescriptionWhen 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.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from [email protected]

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

EPSS: 0.000140000 probability, percentile 0.027330000 (date 2026-05-25)

Problem Types: CWE-1188 | CWE-1188 CWE-1188 Initialization of a Resource with an Insecure Default

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Grafana Grafana All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Grafana Grafana OSS affected 9.4.0 11.6.14 semver OnPrem
CNA Grafana Grafana OSS affected 11.6.14 11.6.14+security-04 custom OnPrem
CNA Grafana Grafana OSS affected 12.0.0 12.2.8 semver OnPrem
CNA Grafana Grafana OSS affected 12.2.8 12.2.8+security-04 custom OnPrem
CNA Grafana Grafana OSS affected 12.3.0 12.3.6 semver OnPrem
CNA Grafana Grafana OSS affected 12.3.6 12.3.6+security-04 custom OnPrem
CNA Grafana Grafana OSS affected 12.4.0 12.4.3 semver OnPrem
CNA Grafana Grafana OSS affected 12.4.3 12.4.3+security-02 custom OnPrem
CNA Grafana Grafana OSS affected 13.0.0 13.0.1 semver OnPrem
CNA Grafana Grafana OSS affected 13.0.1 13.0.1+security-01 custom OnPrem

References

ReferenceSourceLinkTags
grafana.com/security/security-advisories/cve-2026-33376 [email protected] grafana.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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