Critical severity9.8NVD Advisory· Published May 4, 2026· Updated May 27, 2026
CVE-2026-42796
CVE-2026-42796
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.
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Affected products
2Patches
Vulnerability mechanics
References
3- github.com/Arelle/Arelle/pull/2320nvdIssue TrackingPatch
- www.vulncheck.com/advisories/arelle-unauthenticated-rce-via-rest-configurenvdThird Party Advisory
- github.com/Arelle/Arelle/releases/tag/2.39.10nvdRelease Notes
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