CyberSecBulletin
CVE-2026-33376NVD status: Analyzed

Grafana OSS: Initialization of a Resource with an Insecure Default

Published Updated By the CyberSecBulletin desk

CVE-2026-33376 is a high-severity initialization of a resource with an insecure default vulnerability in Grafana OSS from Grafana, with a CVSS 3.1 base score of 7.4 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 11.6.14+security-04, 12.2.8+security-04, 12.3.6+security-04 as the first without the flaw, so updating Grafana OSS to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.28% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Grafana OSS to 11.6.14+security-04 or 12.2.8+security-04 or 12.3.6+security-04 or 12.4.3+security-02, whichever matches your release line, or a later version.
  2. Update Grafana to 11.6.14 or 12.2.8 or 12.3.6 or 12.4.3, whichever matches your release line, or a later version.
  3. Read the advisory on grafana.com for workarounds and exact fixed builds.
  4. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
GrafanaGrafana OSS9.4.0 through 11.6.14; 11.6.14 up to, but not including, 11.6.14+security-04; 12.0.0 through 12.2.8; 12.2.8 up to, but not including, 12.2.8+security-04; 12.3.0 through 12.3.6; 12.3.6 up to, but not including, 12.3.6+security-04; 12.4.0 through 12.4.3; 12.4.3 up to, but not including, 12.4.3+security-02; and 2 more ranges11.6.14+security-04, 12.2.8+security-04, 12.3.6+security-04, 12.4.3+security-02, 13.0.1+security-01
GrafanaGrafana8.5.0 up to, but not including, 11.6.14; 12.2.0 up to, but not including, 12.2.8; 12.3.0 up to, but not including, 12.3.6; 12.4.0 up to, but not including, 12.4.3; 11.6.14; 12.2.8; 12.3.6; 12.4.3; and 2 more ranges11.6.14, 12.2.8, 12.3.6, 12.4.3

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
HighSuccess depends on conditions outside the attacker's control.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
NoneAvailability is not affected.

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N. Scored by CNA (grafana.com).

Official 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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Initialization of a Resource with an Insecure Default

The product initializes or sets a resource with a default that is intended to be changed by the product's installer, administrator, or maintainer, but the default is not secure.

More Initialization of a Resource with an Insecure Default vulnerabilities (CWE-1188)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in Grafana OSS

All Grafana OSS vulnerabilities

Recent Initialization of a Resource with an Insecure Default vulnerabilities

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