by Kastro
Paper/Archive/CVE-2026-42796

CVE-2026-42796

Arelle Arelle — Arelle < 2.39.10 Unauthenticated RCE via /rest/configure

EPSS 3%CVSS 9.8
critical.is priorityof 100
47
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 86.2.862 × 2017.2No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Arelle< 2.39.102.39.10CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

patchgithub.com/Arelle/Arelle/releases/tag/2.39.10refgithub.com/Arelle/Arelle/pull/2320writeupvulncheck.com/advisories/arelle-unauthenticated-rce-via-rest-configure