CVE-2026-41233 Froxlor has a Reseller Domain Quota Bypass via Unvalidated adminid Parameter in Domains.add()

What is CVE-2026-41233?

CVE-2026-41233 is a medium-severity missing authorization vulnerability in froxlor, published on 23 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Froxlor is open source server administration software. Prior to version 2.3.6, in `Domains.add()`, the `adminid` parameter is accepted from user input and used without validation when the calling reseller does not have the `customers_see_all` permission. This allows a reseller to attribute newly created domains to any other admin, bypassing their own domain quota (since the wrong admin's `domains_used` counter is incremented) and potentially exhausting another admin's quota. Version 2.3.6 fixes the issue.

Weakness: CWE-863

Which versions are affected by CVE-2026-41233?

2 open source packages ship an affected version, including froxlor/froxlor. It affects 1 product.

Products include Froxlor Froxlor.

How do I fix CVE-2026-41233?

Upgrade froxlor/froxlor to 2.3.6 or later.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-41233 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41233 exists.

Other vulnerabilities in froxlor

• CVE-2026-41228 Froxlor has Local File Inclusion via path traversal in API `def_language` parameter that leads to Remote Code Execution Critical 10.0
• CVE-2023-6069 Improper Link Resolution Before File Access in froxlor/froxlor Critical 9.9
• CVE-2023-0671 Code Injection in froxlor/froxlor Critical 9.9
• CVE-2023-3173 Improper Restriction of Excessive Authentication Attempts in froxlor/froxlor Critical 9.8
• CVE-2023-1307 Authentication Bypass by Primary Weakness in froxlor/froxlor Critical 9.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-jvx4-xv3m-hrj4.