Vulnerability · Published Mar 6, 2026 · Assigned by GitHub_M

CVE-2026-27605Chartbrew: Stored Cross-Site Scripting (XSS) via File Upload API

Medium 6.3

In plain English

A medium-severity unrestricted file upload in chartbrew from chartbrew. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium

Exploit odds (30 days)0.3%top 83.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
chartbrew	chartbrew	< 4.8.4

Weakness: CWE-434, CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N

References

https://github.com/chartbrew/chartbrew/security/advisories/GHSA-jf6m-hm53-c364 x_refsource_CONFIRM
https://github.com/chartbrew/chartbrew/releases/tag/v4.8.4 x_refsource_MISC