CVE-2026-42796CRITICAL 9.8EPSS p49.5%

CVE-2026-42796CVE-2026-42796

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.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.73% probability of exploitation · percentile 49.5% · 2026-06-18T12:00:27Z
Published2026-05-04
Last modified2026-05-05

Underlying weaknesses· 1

CWE-306

References

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

1

TypeTargetConfidenceTier
WeaknessMissing Authentication for Critical Functioncwe-3060%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.