RCE in Grafana

CVE-2026-33376

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.003 (19.6th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-33376: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

  • Grafana — versions 11.6.14, 12.2.8, 12.3.6
  • Grafana Oss — versions 9.4.0, 11.6.14, 12.0.0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-33376?
CVE-2026-33376 is a high-severity vulnerability in Grafana, classified under Initialization of a Resource with an Insecure Default. CVSS score: 7.4/10. Published 2026-05-13.
How severe is CVE-2026-33376?
High severity. CVSS v3 base score is 7.4 out of 10.