High severity · published May 13, 2026
CVE-2026-33376
Auth Proxy IPv6 whitelist bypass
7.4
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
Grafana · Grafana
9.4.0 through 11.6.14; 11.6.14 before 11.6.14+security-04; 12.0.0 through 12.2.8; 12.2.8 before 12.2.8+security-04; 12.3.0 through 12.3.6; 12.3.6 before 12.3.6+security-04; +4 more · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33376
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33376
Vendor Advisory
https://grafana.com/security/security-advisories/cve-2026-33376
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