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Vulnerability record · CVE-2026-42796 · published 4 May 2026

CVE-2026-42796: Workiva arelle missing authentication for critical function vulnerability

Workiva · Arelle

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.

9.2 CVSS 4.0 Critical EPSS 3.9% · top 10.1% CWE-306 · Missing authentication for critical function
9.2CVSS 4.0 base score
3.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/Arelle/Arelle/pull/2320 Issue TrackingPatch
https://github.com/Arelle/Arelle/releases/tag/2.39.10 Release Notes
https://www.vulncheck.com/advisories/arelle-unauthenticated-rce-via-rest-configure Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-42796), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.