Unauthenticated Remote Code Execution in Arelle

Publication date: 2026-05-04

Last updated on: 2026-05-27

Assigner: VulnCheck

Description

Arelle before 2.39.10 contains an unauthenticated remote code execution vulnerability in the /rest/configure REST endpoint that accepts a plugins query parameter and forwards it to the plugin manager without authentication or authorization. Attackers can supply a URL to a malicious Python file through the plugins parameter, causing the Arelle webserver to download and execute the attacker-controlled code within the Arelle process with its privileges.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-05-04

Last Modified

2026-05-27

Generated

2026-07-06

AI Q&A

2026-05-05

EPSS Evaluated

2026-07-05

NVD

CVE-2026-42796

Affected Vendors & Products

Vendor	Product	Version / Range
workiva	arelle	to 2.39.10 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-306	The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

Attack-Flow Graph

Executive Summary

This vulnerability exists in Arelle versions before 2.39.10 and involves the /rest/configure REST endpoint. The endpoint accepts a plugins query parameter and forwards it to the plugin manager without requiring any authentication or authorization.

An attacker can exploit this by supplying a URL to a malicious Python file through the plugins parameter. The Arelle webserver will then download and execute this attacker-controlled code within the Arelle process, running with the same privileges as the server.

Impact Analysis

This vulnerability allows an unauthenticated attacker to remotely execute arbitrary code on the server running Arelle. This can lead to full compromise of the affected system, including unauthorized access, data theft, data manipulation, or disruption of services.

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