What is the CVSS score of CVE-2026-27603?

CVE-2026-27603 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.1%.

Which versions of Chartbrew are affected by CVE-2026-27603?

Chartbrew versions 4.8.4 and earlier contain a critical authentication bypass vulnerability that allows attackers to access sensitive functions without valid credentials.

Is there a public PoC exploit available for CVE-2026-27603?

Yes, a public proof-of-concept exploit is available for CVE-2026-27603. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-27603?

Within 24 hours: inventory all Chartbrew instances and document versions in use; isolate affected systems from production if possible and restrict network access. Within 7 days: implement network segmentation to limit Chartbrew access to authorized users only; deploy WAF rules to block suspicious requests to authentication-bypass endpoints; contact Chartbrew vendor for patch timeline and interim security guidance. Within 30 days: upgrade to patched version immediately upon availability; if upgrade unavailable, conduct full risk assessment for continued use versus decommissioning affected instances.

Chartbrew CVE-2026-27603

HIGH

Missing Authentication for Critical Function (CWE-306)

2026-03-06 security-advisories@github.com

Authentication Bypass Chartbrew

7.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:06 vuln.today

PoC Detected

Mar 10, 2026 - 14:02 vuln.today

Public exploit code

CVE Published

Mar 06, 2026 - 05:16 nvd

HIGH 7.5

DescriptionGitHub Advisory

Chartbrew is an open-source web application that can connect directly to databases and APIs and use the data to create charts. Prior to version 4.8.4, the chart filter endpoint POST /project/:project_id/chart/:chart_id/filter is missing both verifyToken and checkPermissions middleware, allowing unauthenticated users to access chart data from any team/project. This issue has been patched in version 4.8.4.

AnalysisAI

Chartbrew versions up to 4.8.4 is affected by missing authentication for critical function (CVSS 7.5).

Technical ContextAI

This vulnerability (CWE-306: Missing Authentication for Critical Function) affects Chartbrew. Chartbrew is an open-source web application that can connect directly to databases and APIs and use the data to create charts. Prior to version 4.8.4, the chart filter endpoint POST /project/:project_id/chart/:chart_id/filter is missing both verifyToken and checkPermissions middleware, allowing unauthenticated users to access chart data from any team/project. This issue has been patched in version 4.8.4.