CVE-2026-40595

High

Published: 30 April 2026

Published

30 April 2026

Modified

01 May 2026

KEV Added

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Patch

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CVSS Score 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Score 0.0006 19.4th percentile

Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-40595 is a high-severity Improper Access Control (CWE-284) vulnerability. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 19.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 AC-22 (Publicly Accessible Content) and AC-24 (Access Control Decisions).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190). What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

AC-3 Access Enforcement good match

prevent

Enforces approved authorizations for accessing specific charts in public projects, directly addressing the incomplete verification of chart-level access and SharePolicy.

AC-22 Publicly Accessible Content good match

prevent

Controls designation and review of publicly accessible content, preventing exposure of intentionally hidden charts via public routes.

AC-24 Access Control Decisions good match

prevent

Ensures access control decisions for chart retrieval and export incorporate specific attributes like SharePolicy and report inclusion beyond project-level checks.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

Why these techniques?

The vulnerability is an improper access control flaw in public routes of a public-facing web application (Chartbrew), directly enabling unauthenticated remote exploitation to access unauthorized data.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

Chartbrew is an open-source web application that can connect directly to databases and APIs and use the data to create charts. In version 4.9.0, Chartbrew exposes public chart retrieval and export routes that only verify project-level public access and, for…

exports, a team-level export toggle. The routes do not verify whether the target chart is actually allowed on the public report or whether the governing SharePolicy permits public access. An unauthenticated attacker who knows a chart identifier in a public project can read or export chart data for charts that were intentionally hidden from the report. This issue has been patched in version 5.0.0.

Deeper analysisAI

CVE-2026-40595 affects Chartbrew, an open-source web application that connects directly to databases and APIs to generate charts from data. In version 4.9.0, the application exposes public routes for chart retrieval and export that perform incomplete access checks. These routes verify only project-level public access and, for exports, a team-level export toggle, but fail to confirm whether the specific target chart is included in the public report or permitted by the governing SharePolicy. This constitutes an improper access control vulnerability (CWE-284), with 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), indicating high confidentiality impact.

An unauthenticated attacker can exploit this vulnerability if they know the identifier of a chart within a public project. By accessing the public retrieval or export routes, they can read or export sensitive chart data that administrators intentionally excluded from public reports, bypassing intended restrictions.

The issue has been addressed in Chartbrew version 5.0.0, as detailed in the project's release notes and GitHub security advisory GHSA-mq7q-6xh6-5649. Security practitioners should upgrade to version 5.0.0 or later to mitigate the vulnerability.