---
id: CVE-2026-42796
title: Arelle < 2.39.10 Unauthenticated RCE via /rest/configure
summary: >-
  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 authorizati…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-306
vendor: Arelle
product: Arelle
affected:
  - Arelle < 2.39.10
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-05-04T20:21:28.928481Z'
exploitAvailable: true
published: '2026-05-04'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:03:19.409Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-42796'
references:
  - url: 'https://github.com/Arelle/Arelle/releases/tag/2.39.10'
    label: Arelle 2.39.10 Release Notes
  - url: 'https://github.com/Arelle/Arelle/pull/2320'
  - url: >-
      https://www.vulncheck.com/advisories/arelle-unauthenticated-rce-via-rest-configure
tags:
  - cve.org
  - exploit-available
epss: 0.02747
epssPercentile: 0.8629
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/ameerhamza-malik/CVE-2026-42796'
  nuclei:
    - CVE-2026-42796
  checkedAt: '2026-11-08T14:51:57.345Z'
ingestedAt: '2026-11-08T14:51:22.432Z'
---

## Overview

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

- `Arelle < 2.39.10`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.