CVE-2026-42796 CRITICAL

CVE-2026-42796: Arelle < 2.39.10 Unauthenticated RCE via /rest/configure

Vendor Arelle
Product Arelle
Weakness CWE-306 · Missing auth
Published May 4, 2026
Last update May 4, 2026

CVSS base score

9.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 4, 2026 CVE published
May 4, 2026 Record updated