CVE-2026-100392 InvoicePlane: Primary Administrator Privilege Downgrade via `Users::form()` (Missing Object-Level Authorization)
A secondary administrator can downgrade the primary administrator's privileges to guest, locking the owner out of the InvoicePlane instance.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100392?
CVE-2026-100392 is a high-severity missing authorization vulnerability in InvoicePlane, published on 28 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
InvoicePlane is a self-hosted open source application for managing invoices, clients, and payments. In version 1.7.2, Users::form() performs no object-level authorization check on user_id = 1. A Secondary Administrator (user_type = 1, user_id != 1) can rewrite the Primary Administrator's user_type to 2 (Guest / read-only), destroying the root account's privilege and locking the legitimate owner out of the instance. At time of publication, there are no publicly available patches.
Weakness: CWE-863
Which versions are affected by CVE-2026-100392?
How do I fix CVE-2026-100392?
No fix has been published for CVE-2026-100392 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-100392 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100392 exists.
Sources
Also known as GHSA-4fxw-x7wr-x6qc.