Arelle < 2.39.10 Unauthenticated RCE via /rest/configure

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What is CVE-2026-42796?

CVE-2026-42796 is a vulnerability classified as Missing Authentication for Critical Function, affecting Arelle (affected versions: < 2.39.10). This vulnerability is rated Critical, with a CVSS score of 9.2. Current sources do not report this vulnerability as exploited.

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Overview

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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.

Affected products and scope

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Technical details

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Exploitability

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Technical impact

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Business impact

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Detection

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