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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.

PUBLISHED Reserved 2026-04-29 | Published 2026-05-04 | Updated 2026-05-04 | Assigner VulnCheck




CRITICAL: 9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-306 Missing Authentication for Critical Function

Product status

Default status
affected

Any version before 2.39.10
affected

Credits

Mobasi Security Team finder

References

github.com/Arelle/Arelle/releases/tag/2.39.10 release-notes patch

github.com/Arelle/Arelle/pull/2320 issue-tracking

www.vulncheck.com/...-unauthenticated-rce-via-rest-configure third-party-advisory

cve.org (CVE-2026-42796)

nvd.nist.gov (CVE-2026-42796)

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