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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Arelle | Arelle | < 2.39.10 | 2.39.10 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
-
ameerhamza-malik/CVE-2026-42796 ★ 0 · May 8, 2026
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Automated scanner template
A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.
- Arelle < 2.39.10 - Remote Code Execution http/cves/2026/CVE-2026-42796.yaml
Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.
References
- Arelle 2.39.10 Release Notes release-notes patch
- https://github.com/Arelle/Arelle/pull/2320 issue-tracking patch
- https://www.vulncheck.com/advisories/arelle-unauthenticated-rce-via-rest-configure third-party-advisory