CVE-2026-42796 Details.
Arelle < 2.39.10 - Remote Code Execution
Atlas does not check this one. Needs an outside server.
To test for this one, the site would have to contact a server outside your network and report back. Atlas does not run checks that need that, so it does not run this one.
About CVE-2026-42796. What It Means.
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.
Affected Product. What Is Hit.
- Vendor
- arelle
- Product
- Arelle
FAQ
Common Questions.
Arelle < 2.39.10 - Remote Code Execution. 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.
No. To test for this one, the site would have to contact a server outside your network and report back. Atlas does not run checks that need that, so it does not run this one. The facts about CVE-2026-42796 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
CVE-2026-42796 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing.
Update Arelle to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-42796. Atlas does not run a check for it, so nothing here says whether a particular site is affected.