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CVE-2026-42796— Arelle < 2.39.10 Unauthenticated RCE via /rest/configure

Quick assessment

Affected
Arelle Arelle
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Arelle是Arelle开源的一个开源XBRL平台，支持数据验证与集成。 Arelle 2.39.10之前版本存在访问控制错误漏洞，该漏洞源于/rest/configure REST端点接受plugins查询参数并转发给插件管理器而未进行身份验证或授权，可能导致未经身份验证的远程代码执行。

CVSS 9.8 · Critical EPSS 2.75% · P86

Public Exploits 1

Nuclei · 1 CVE-2026-42796.yaml [template]

Affected Version Matrix 1

VendorProduct Version RangeStatus
Arelle Arelle < 2.39.10 affected
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I. Basic Information for CVE-2026-42796

Vulnerability Information
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Vulnerability Title
Arelle < 2.39.10 Unauthenticated RCE via /rest/configure
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Arelle 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Arelle是Arelle开源的一个开源XBRL平台，支持数据验证与集成。 Arelle 2.39.10之前版本存在访问控制错误漏洞，该漏洞源于/rest/configure REST端点接受plugins查询参数并转发给插件管理器而未进行身份验证或授权，可能导致未经身份验证的远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Arelle Arelle 0 ~ 2.39.10 -

II. Public POCs for CVE-2026-42796

# POC Description Source Link Shenlong Link
1 Arelle before 2.39.10 contains an unauthenticated remote code execution vulnerability in the webserver's /rest/configure endpoint. The plugins query parameter is forwarded to the plugin manager without authentication, allowing an attacker to supply a URL to a remote Python file that Arelle downloads and executes within its process. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-42796.yaml POC Details
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III. Intelligence Information for CVE-2026-42796

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Patches & Fixes for CVE-2026-42796 (1)

Vendor Advisories for CVE-2026-42796 (1)

Vendor Pages for CVE-2026-42796 (1)

IV. Related Vulnerabilities

Same weakness: CWE-306

V. Comments for CVE-2026-42796

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