CVE-2026-42796 | Arelle before 2.39.10 contains an unauthenticated remote cod… | CVSS 9.8 CRITICAL

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.

Metadata

CVE ID: CVE-2026-42796
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-04-29 20:58 UTC
Published: 2026-05-04 17:19 UTC
Last updated: 2026-07-14 20:01 UTC
Primary CWE: CWE-306
CWE-306 Missing Authentication for Critical Function
Vendor / Product: Arelle / Arelle
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
Arelle	Arelle	—	0 < 2.39.10

Weakness (CWE)

CWE	Source	Description
CWE-306	cna	CWE-306 Missing Authentication for Critical Function

CVSS scores (2)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.2	CRITICAL	4.0	cna	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

References (3)