CVE-2026-33376
HIGHGrafana OSS Insecure Default IPv6 Allow-List Mask in Auth Proxy
Title source: llmDescription
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.
References (1)
Core 1
Core References
Vendor Advisory vendor-advisory
https://grafana.com/security/security-advisories/cve-2026-33376
Scores
CVSS v3
7.4
EPSS
0.0027
EPSS Percentile
18.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-1188
Status
published
Products (17)
grafana/grafana
11.6.14 (2 CPE variants)
grafana/grafana
12.2.8 (2 CPE variants)
grafana/grafana
12.3.6 (2 CPE variants)
grafana/grafana
12.4.3
grafana/grafana
13.0.0
grafana/grafana
13.0.1
grafana/grafana
8.5.0 - 11.6.14
Grafana/Grafana OSS
11.6.14 - 11.6.14+security-04
Grafana/Grafana OSS
12.0.0 - 12.2.8
Grafana/Grafana OSS
12.2.8 - 12.2.8+security-04
... and 7 more
Published
May 13, 2026
Tracked Since
May 14, 2026