CVE-2026-33376 HIGH

CVE-2026-33376: Auth Proxy IPv6 whitelist bypass

Vendor Grafana
Product Grafana OSS
Published May 13, 2026
Last update June 12, 2026

CVSS base score

7.4/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 13, 2026 CVE published
June 12, 2026 Record updated