XSS in Chartbrew
CVE-2026-27605
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (21.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Chartbrew — versions < 4.8.4
- Depomo Chartbrew
Weakness classification (CWE)
References
- github.com/chartbrew/chartbrew/security/advisories/GHSA-jf6m-hm53-c364 (Exploit, Vendor Advisory)
- github.com/chartbrew/chartbrew/releases/tag/v4.8.4 (Release Notes)
Frequently asked questions
- What is CVE-2026-27605?
- CVE-2026-27605 is a medium-severity vulnerability in Chartbrew, classified under Cross-site Scripting. CVSS score: 6.3/10. Published 2026-03-06.
- How severe is CVE-2026-27605?
- Medium severity. CVSS v3 base score is 6.3 out of 10.