What is CVE-2026-27603?

CVE-2026-27603 is a high-severity vulnerability in Chartbrew, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-03-06.

How severe is CVE-2026-27603?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Chartbrew

CVE-2026-27603

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.

Vulnerability class: Broken Authentication

Published 2026-03-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.005 (38.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001

Affected products

Chartbrew — versions < 4.8.4
Depomo Chartbrew

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

github.com/chartbrew/chartbrew/security/advisories/GHSA-9fhr-5vvc-p455 (Exploit, Mitigation, Vendor Advisory)
github.com/chartbrew/chartbrew/releases/tag/v4.8.4 (Release Notes)

Frequently asked questions

What is CVE-2026-27603?: CVE-2026-27603 is a high-severity vulnerability in Chartbrew, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-03-06.
How severe is CVE-2026-27603?: High severity. CVSS v3 base score is 7.5 out of 10.