CVE-2026-27603
Published: 06 March 2026
Summary
CVE-2026-27603 is a high-severity Missing Authentication for Critical Function (CWE-306) vulnerability in Depomo Chartbrew. Its CVSS base score is 8.7 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 33.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and IA-2 (Identification and Authentication (Organizational Users)).
Deeper analysis
CVE-2026-27603 is a missing authentication vulnerability in Chartbrew, an open-source web application that connects directly to databases and APIs to create charts from data. In versions prior to 4.8.4, the POST /project/:project_id/chart/:chart_id/filter endpoint lacks both verifyToken and checkPermissions middleware. This flaw allows unauthenticated users to access chart data from any team or project. The vulnerability carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) and maps to CWE-306 (Missing Authentication for Critical Function).
Unauthenticated attackers with network access can exploit this issue remotely with low complexity and no user interaction required. By sending a POST request to the vulnerable endpoint with arbitrary project_id and chart_id values, attackers can retrieve chart data from any project, potentially exposing sensitive information visualized in those charts, such as database query results or API-derived insights.
Chartbrew has patched this vulnerability in version 4.8.4. Administrators should upgrade to this version or later to mitigate the issue. Additional details are available in the GitHub security advisory at https://github.com/chartbrew/chartbrew/security/advisories/GHSA-9fhr-5vvc-p455 and the release notes at https://github.com/chartbrew/chartbrew/releases/tag/v4.8.4.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-9979
Vulnerability details
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…
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users to access chart data from any team/project. This issue has been patched in version 4.8.4.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Missing authentication on a public-facing web app endpoint (POST /project/:project_id/chart/:chart_id/filter) directly enables remote unauthenticated exploitation to access arbitrary chart data, matching T1190: Exploit Public-Facing Application.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Enforces approved authorizations for logical access to information and resources, directly addressing the missing verifyToken and checkPermissions middleware on the chart filter endpoint.
Requires unique identification and authentication of organizational users, preventing unauthenticated access to sensitive chart data via the vulnerable endpoint.
Mandates timely flaw remediation, such as patching Chartbrew to version 4.8.4 to add the missing authentication middleware.