CVE-2026-42796
Arelle < 2.39.10 Unauthenticated RCE via /rest/configure
- State
- Published
- Severity
- 9.2 Critical
- Published
- May 4, 2026
- Updated
- Jul 14, 2026
- Reserved
- Apr 29, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.2 Critical | 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 | VulnCheck |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-306 Missing Authentication for Critical Function
Affected Products
| Product | Versions |
|---|---|
ArelleArelle |
|
References
- https://github.com/Arelle/Arelle/releases/tag/2.39.10release-notespatch
- https://github.com/Arelle/Arelle/pull/2320issue-tracking
- https://www.vulncheck.com/advisories/arelle-unauthenticated-rce-via-rest-configurethird-party-advisory
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