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

> Attackers can upload malicious HTML files to execute scripts, potentially stealing authentication tokens and taking over user accounts.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 6 Mar 2026
- **Updated:** 6 Mar 2026
- **Also known as:** GHSA-jf6m-hm53-c364

## What is CVE-2026-27605?

CVE-2026-27605 is a medium-severity cross-site scripting vulnerability in chartbrew, published on 6 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### 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.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation), CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2026-27605?

It affects 1 product.


Products: Depomo Chartbrew.

## How do I fix CVE-2026-27605?

No fix has been published for CVE-2026-27605 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-27605 being exploited?

There is no known exploitation of CVE-2026-27605 in the wild and no public exploit code.

## Other vulnerabilities in chartbrew

- [CVE-2026-25888](https://insights.sbomify.com/CVE-2026-25888/): Chartbrew: Remote Code Execution (RCE) via Vulnerable API (high 8.8)
- [CVE-2026-27005](https://insights.sbomify.com/CVE-2026-27005/): Chartbrew: SQL injection in date-type variable handling (applyMysqlOrPostgresVariables) (high 8.8)
- [CVE-2026-27603](https://insights.sbomify.com/CVE-2026-27603/): Missing authorization in chartbrew (high 8.7)
- [CVE-2026-30232](https://insights.sbomify.com/CVE-2026-30232/): Chartbrew has SSRF in API Data Connection - No IP Validation on User-Provided URLs (high 7.8)
- [CVE-2026-32252](https://insights.sbomify.com/CVE-2026-32252/): Chartbrew Cross-Tenant Template Export and Secret Disclosure in `GET /team/:team_id/template/generate/:project_id` (high 7.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27605 and fix it if it is affected.

What it is: CVE-2026-27605 is a medium-severity cross-site scripting vulnerability in chartbrew, published on 6 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-27605 in the wild and no public exploit code.

Affected product: chartbrew. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-27605/ (Markdown: https://insights.sbomify.com/CVE-2026-27605/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27605
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27605
- OSV: https://osv.dev/vulnerability/CVE-2026-27605

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27605/
Summaries are generated and may contain mistakes; the official description above is the record.