CVE-2026-33376— Auth Proxy IPv6 whitelist bypass
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 10
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Grafana | Grafana OSS | 9.4.0≤ 11.6.14 | affected |
11.6.14< 11.6.14+security-04 | affected | ||
12.0.0≤ 12.2.8 | affected | ||
12.2.8< 12.2.8+security-04 | affected | ||
12.3.0≤ 12.3.6 | affected | ||
12.3.6< 12.3.6+security-04 | affected | ||
12.4.0≤ 12.4.3 | affected | ||
12.4.3< 12.4.3+security-02 | affected | ||
| … +2 more rows | |||
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I. Basic Information for CVE-2026-33376
Vulnerability Information
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Vulnerability Title
Auth Proxy IPv6 whitelist bypass
Source: NVD (National Vulnerability Database)
Vulnerability 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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Grafana OSS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grafana OSS是Grafana开源的一个可视化仪表盘。 Grafana OSS存在安全漏洞，该漏洞源于Auth Proxy功能使用IPv6允许列表时默认为/32地址，可能导致配置问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Grafana | Grafana OSS | 9.4.0 ~ 11.6.14 | - |
II. Public POCs for CVE-2026-33376
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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Same Patch Batch · Grafana · 2026-05-13 · 10 CVEs total
| CVE-2026-33377 | 7.1 HIGH | Dashboard Import Overwrites ACL — Editor Privilege Escalation to Dashboard Admin |
| CVE-2026-28379 | 6.5 MEDIUM | Viewer-triggered race condition in Grafana Live leads to complete server crash |
| CVE-2026-28380 | 6.5 MEDIUM | BAC in Snapshot API allows deletion of unauthorized dashboard snapshots |
| CVE-2026-28383 | 6.5 MEDIUM | Grafana plugin resources can lead to unbounded memory allocation |
| CVE-2026-28376 | 6.5 MEDIUM | Grafana Live push endpoint allows unbounded memory allocation leading to OOM |
| CVE-2026-33378 | 6.5 MEDIUM | Grafana Data Source Plugin: DoS (OOM) via Negative Interval Injection in $__timeGroup Macr |
| CVE-2026-33380 | 6.3 MEDIUM | SQL Expressions Read File From Disk |
| CVE-2026-33381 | 5.9 MEDIUM | Users can generate Service Account tokens after permissions removal |
| CVE-2026-28374 | 4.3 MEDIUM | IDOR in Annotations API allows unprivileged users to DELETE annotation |
IV. Related Vulnerabilities
Same product: Grafana OSS
- CVE-2026-28374
IDOR in Annotations API allows unprivileged users to DELETE - CVE-2026-33378
Grafana Data Source Plugin: DoS (OOM) via Negative Interval - CVE-2026-28383
Grafana plugin resources can lead to unbounded memory alloca - CVE-2026-33380
SQL Expressions Read File From Disk - CVE-2026-33381
Users can generate Service Account tokens after permissions
Same vendor: Grafana
- CVE-2026-28374
IDOR in Annotations API allows unprivileged users to DELETE - CVE-2026-33378
Grafana Data Source Plugin: DoS (OOM) via Negative Interval - CVE-2026-28383
Grafana plugin resources can lead to unbounded memory alloca - CVE-2026-33380
SQL Expressions Read File From Disk - CVE-2026-28380
BAC in Snapshot API allows deletion of unauthorized dashboar
V. Comments for CVE-2026-33376
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