CVE-2026-42796

CRITICAL 9.8

Arelle < 2.39.10 Unauthenticated RCE via /rest/configure

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-306
Vendor	arelle
Product	arelle
Published	May 4, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Arelle / Arelle

0 < 2.39.10

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/Arelle/Arelle/releases/tag/2.39.10 github.com: https://github.com/Arelle/Arelle/pull/2320 vulncheck.com: https://www.vulncheck.com/advisories/arelle-unauthenticated-rce-via-rest-configure

Credits

Mobasi Security Team