CVE-2026-42796 Arelle < 2.39.10 Unauthenticated RCE via /rest/configure
Unauthenticated attackers can execute arbitrary code by supplying a malicious URL to the /rest/configure endpoint in Arelle.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-42796?
CVE-2026-42796 is a critical code injection vulnerability in Arelle, published on 4 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-306
Which versions are affected by CVE-2026-42796?
It affects 1 product.
Products include Workiva Arelle.
How do I fix CVE-2026-42796?
No fix has been published for CVE-2026-42796 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-42796 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42796 exists.
Public exploit code: 1 Nuclei template and 1 proofs of concept on GitHub.
Sources
Also known as GHSA-m48p-vcj6-wq3j.