InvoicePlane 1.7.2 Form Users::form user_id improper authorization

Summaryinfo

A vulnerability identified as problematic has been detected in InvoicePlane 1.7.2. The affected element is the function Users::form of the component Form. This manipulation of the argument user_id causes improper authorization. This vulnerability is registered as CVE-2026-100392. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as problematic was found in InvoicePlane 1.7.2. Affected by this vulnerability is the function Users::form of the component Form. The manipulation of the argument user_id with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-100392 since 09/25/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation requires an enhanced level of successful authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/28/2026). The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• InvoicePlane

Version

• 1.7.2

Website

• Product: https://github.com/InvoicePlane/InvoicePlane/

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