CVE-2026-42796

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 v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/Arelle/Arelle/pull/2320	Issue Tracking Patch
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

Configurations

Configuration 1 (hide)

cpe:2.3:a:workiva:arelle:*:*:*:*:*:*:*:*

History

27 May 2026, 18:54

Type	Values Removed	Values Added
First Time		Workiva arelle Workiva
CPE		cpe:2.3:a:workiva:arelle::::::::
References	~~() https://github.com/Arelle/Arelle/pull/2320 -~~	() https://github.com/Arelle/Arelle/pull/2320 - Issue Tracking, Patch
References	~~() https://github.com/Arelle/Arelle/releases/tag/2.39.10 -~~	() https://github.com/Arelle/Arelle/releases/tag/2.39.10 - Release Notes
References	~~() https://www.vulncheck.com/advisories/arelle-unauthenticated-rce-via-rest-configure -~~	() https://www.vulncheck.com/advisories/arelle-unauthenticated-rce-via-rest-configure - Third Party Advisory

04 May 2026, 18:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-04 18:16

Updated : 2026-05-27 18:54

NVD link : CVE-2026-42796

Mitre link : CVE-2026-42796

CVE.ORG link : CVE-2026-42796

JSON object : View

Products Affected

workiva

arelle

CWE

CWE-306

Missing Authentication for Critical Function

{"id": "CVE-2026-42796", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "disclosure@vulncheck.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 9.2, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "valueDensity": "NOT_DEFINED", "vectorString": "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:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2026-05-04T18:16:32.520", "references": [{"url": "https://github.com/Arelle/Arelle/pull/2320", "tags": ["Issue Tracking", "Patch"], "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/Arelle/Arelle/releases/tag/2.39.10", "tags": ["Release Notes"], "source": "disclosure@vulncheck.com"}, {"url": "https://www.vulncheck.com/advisories/arelle-unauthenticated-rce-via-rest-configure", "tags": ["Third Party Advisory"], "source": "disclosure@vulncheck.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-306"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-05-27T18:54:25.937", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:workiva:arelle:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9E072549-C39B-4895-B145-6F5D89378E7C", "versionEndExcluding": "2.39.10"}], "operator": "OR"}]}], "sourceIdentifier": "disclosure@vulncheck.com"}