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CVE-2026-42796

CriticalPublished

Arelle < 2.39.10 Unauthenticated RCE via /rest/configure

Published: May 4, 2026
Updated: Jul 14, 2026
Assigning CNA: VulnCheck
Evidence observed: Aug 26, 2026

Primary CVSS

9.2/ 10Critical

nvd · CVSS 4.0

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

2.7%

Low · next 30 days

Percentile: 85.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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 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.

Sources

CVE-2026-42796PoC
Exploit code for CVE-2026-42796, a proof-of-concept demonstrating the vulnerability.

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