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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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).

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Send POST request to filter endpoint

Exploit

Bypass missing authentication middleware

Execution

Access chart data from arbitrary projects

Impact

Retrieve sensitive database information

Access

Send POST request to filter endpoint

Exploit

Bypass missing authentication middleware

Execution

Access chart data from arbitrary projects

Impact

Retrieve sensitive database information

Vulnerability AssessmentAI

Exploitation	POST /project/:project_id/chart/:chart_id/filter endpoint lacks verifyToken and checkPermissions middleware. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	CVSS 7.5 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker without authentication could exploit this vulnerability to compromise the affected system.
Remediation	Fixed in version 4.8.4.. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: inventory all Chartbrew instances and document versions in use; isolate affected systems from production if possible and restrict network access. …

Threat intelligence, references, and detailed analysis are available after sign-in.

CVE-2026-27603 vulnerability details – vuln.today

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Chartbrew CVE-2026-27603

Severity by source

CVSS VectorGitHub Advisory

Lifecycle Timeline

DescriptionGitHub Advisory

AnalysisAI

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Attack ChainAIDerived

Vulnerability AssessmentAI

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External POC / Exploit Code