What is the CVSS score of CVE-2026-27605?

CVE-2026-27605 has a CVSS 3.1 base score of 6.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N. EPSS exploitation probability: 0.1%.

Which versions of Chartbrew are affected by CVE-2026-27605?

Organizations using Chartbrew should be aware of moderate risk from CVE-2026-27605, a cross-site scripting vulnerability rated CVSS 6.3.

Is there a public PoC exploit available for CVE-2026-27605?

Yes, a public proof-of-concept exploit is available for CVE-2026-27605. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-27605?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Chartbrew CVE-2026-27605

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

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

XSS Chartbrew

6.3

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.3 MEDIUM

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

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

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:06 vuln.today

PoC Detected

Mar 10, 2026 - 14:01 vuln.today

Public exploit code

CVE Published

Mar 06, 2026 - 05:16 nvd

MEDIUM 6.3

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 application allows uploading files (project logos) without validating the file type or content. It trusts the extension provided by the user. These files are saved to the uploads/ directory and served statically. An attacker can upload an HTML file containing malicious JavaScript. Since authentication tokens are likely stored in localStorage (as they are returned in the API body), this XSS can lead to account takeover. This issue has been patched in version 4.8.4.

AnalysisAI

Chartbrew versions prior to 4.8.4 allow authenticated users to upload arbitrary files by bypassing file type validation, enabling stored XSS attacks through malicious HTML files served from the uploads directory. An attacker can exploit this to steal authentication tokens stored in localStorage and achieve account takeover. …

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Vulnerability AssessmentAI

Risk Assessment	CVSS 6.3 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker could exploit this vulnerability to account takeover.
Remediation	Fixed in version 4.8.4.. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. …

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CVE-2026-27605 vulnerability details – vuln.today

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