Vulnerability details
CVE-2026-33376
Grafana OSS
Auth Proxy IPv6 whitelist bypass
CVSS 3.1
7.4High
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.4High | 3.1 | CVEProject cvelistV5 (CNA) (GRAFANA) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Grafana | Grafana OSS | 11.6.14 ≤ v < 11.6.14+security-04 | CVEProject cvelistV5 (CNA) |
| Grafana | Grafana OSS | 12.0.0 ≤ v ≤ 12.2.8 | CVEProject cvelistV5 (CNA) |
| Grafana | Grafana OSS | 12.2.8 ≤ v < 12.2.8+security-04 | CVEProject cvelistV5 (CNA) |
| Grafana | Grafana OSS | 12.3.0 ≤ v ≤ 12.3.6 | CVEProject cvelistV5 (CNA) |
| Grafana | Grafana OSS | 12.3.6 ≤ v < 12.3.6+security-04 | CVEProject cvelistV5 (CNA) |
| Grafana | Grafana OSS | 12.4.0 ≤ v ≤ 12.4.3 | CVEProject cvelistV5 (CNA) |
| Grafana | Grafana OSS | 12.4.3 ≤ v < 12.4.3+security-02 | CVEProject cvelistV5 (CNA) |
| Grafana | Grafana OSS | 13.0.0 ≤ v ≤ 13.0.1 | CVEProject cvelistV5 (CNA) |
| Grafana | Grafana OSS | 13.0.1 ≤ v < 13.0.1+security-01 | CVEProject cvelistV5 (CNA) |
| Grafana | Grafana OSS | 9.4.0 ≤ v ≤ 11.6.14 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://grafana.com/security/security-advisories/cve-2026-33376 vendor-advisory
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Details
- Published
- 2026-05-13
- Last updated
- 2026-08-27
- State
- Published
- Assigner (CNA)
- GRAFANA
Exploit prediction (EPSS)
0.28%
Probability of exploitation in 30 days
20.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-1188Initialization of a Resource with an Insecure Default