CVE-2026-33376

Auth Proxy IPv6 whitelist bypass

State: Published
Severity: 7.4 High
Published: May 13, 2026
Updated: Aug 27, 2026
Reserved: Mar 19, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.4 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N	GRAFANA

Weaknesses

CWE-1188 Initialization of a Resource with an Insecure Default

Affected Products

Product	Versions
Grafana OSSGrafana	9.4.0 through 11.6.14Affected 11.6.14 to before 11.6.14+security-04Affected 12.0.0 through 12.2.8Affected 12.2.8 to before 12.2.8+security-04Affected 12.3.0 through 12.3.6Affected 12.3.6 to before 12.3.6+security-04Affected 12.4.0 through 12.4.3Affected 12.4.3 to before 12.4.3+security-02Affected 13.0.0 through 13.0.1Affected 13.0.1 to before 13.0.1+security-01Affected

References

https://grafana.com/security/security-advisories/cve-2026-33376vendor-advisory

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