InvoicePlane up to 1.7.1 Session Management Users::form user_type improper authorization

Summaryinfo

A vulnerability has been found in InvoicePlane up to 1.7.1 and classified as problematic. The impacted element is the function Users::form of the component Session Management. The manipulation of the argument user_type leads to improper authorization. This vulnerability is listed as CVE-2026-88003. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in InvoicePlane up to 1.7.1. This issue affects the function Users::form of the component Session Management. The manipulation of the argument user_type with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

InvoicePlane is a self-hosted open source application for managing invoices, clients, and payments. Prior to 1.7.2, InvoicePlane fails to revoke administrative privileges after a role downgrade because Admin_Controller trusts the user_type snapshot stored in an existing session instead of revalidating ip_users.user_type. When one administrator downgrades another account, the target's active session continues to authorize administrative requests. The downgraded user can use Users::form() to set user_type back to 1, restoring the database role and making the privilege escalation persistent. This vulnerability is fixed in 1.7.2.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-88003 since 09/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are necessary for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

Upgrading to version 1.7.2 eliminates this vulnerability.

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Productinfo

Name

• InvoicePlane

Version

• 1.7.0
• 1.7.1

Website

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

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