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CVE-2026-42796: arelle vulnerability
CVE-2026-42796: critical vulnerability affecting arelle. Check CVSS, KEV status, business impact and recommended administrator actions.
- CVSS
- 9.2 CRITICAL
- EPSS
- 82.42%
- Known exploited
- not in KEV
- Product
- arelle
What is known
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.
Business impact
Successful exploitation of CVE-2026-42796, a critical vulnerability (CVSS 9.2) affecting arelle, may affect the confidentiality, integrity or availability of the vulnerable environment. The exact impact depends on the installed version, exposed interfaces and deployment configuration.
Recommended administrator action
Confirm whether arelle is present and compare installed versions with the vendor advisory and NVD record. Apply the vendor patch or documented mitigation; until remediation is complete, reduce exposure of affected interfaces, review relevant logs and monitor for indicators of exploitation. DataHouse can support version verification, managed patching, network exposure reduction, log review and backup validation for dedicated, cloud and colocated environments.