CVE-2026-33376
Auth Proxy IPv6 whitelist bypass
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.
INFO
Published Date :
May 13, 2026, 8:16 p.m.
Last Modified :
June 2, 2026, 7:28 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Add explicit /128 mask to IPv6 addresses in allow-list.
- Verify Auth Proxy configuration for IPv6 settings.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33376.
| URL | Resource |
|---|---|
| https://grafana.com/security/security-advisories/cve-2026-33376 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33376 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-33376
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33376 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-33376 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jun. 02, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:* versions from (including) 12.2.0 up to (excluding) 12.2.8 *cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:* versions from (including) 12.3.0 up to (excluding) 12.3.6 *cpe:2.3:a:grafana:grafana:11.6.14:security01:*:*:*:*:*:* *cpe:2.3:a:grafana:grafana:12.2.8:security01:*:*:*:*:*:* *cpe:2.3:a:grafana:grafana:12.3.6:security01:*:*:*:*:*:* *cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:* versions from (including) 12.4.0 up to (excluding) 12.4.3 *cpe:2.3:a:grafana:grafana:11.6.14:-:*:*:*:*:*:* *cpe:2.3:a:grafana:grafana:12.2.8:-:*:*:*:*:*:* *cpe:2.3:a:grafana:grafana:12.3.6:-:*:*:*:*:*:* *cpe:2.3:a:grafana:grafana:13.0.0:*:*:*:*:*:*:* *cpe:2.3:a:grafana:grafana:13.0.1:-:*:*:*:*:*:* *cpe:2.3:a:grafana:grafana:12.4.3:-:*:*:*:*:*:* *cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:* versions from (including) 8.5.0 up to (excluding) 11.6.14 Added Reference Type Grafana Labs: https://grafana.com/security/security-advisories/cve-2026-33376 Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 14, 2026
Action Type Old Value New Value Added CWE CWE-1188 -
New CVE Received by [email protected]
May. 13, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Added Reference https://grafana.com/security/security-advisories/cve-2026-33376