Vulnerability Description
InvoicePlane is a self-hosted open source application for managing invoices, clients, and payments. Prior to 1.7.2-beta-1, guest users can approve or reject quotes belonging to any client, not just their assigned clients. The `approve()` and `reject()` methods in the Guest Quotes controller, `application/modules/guest/controllers/Quotes.php`, call `approve_quote_by_id($quote_id)` and `reject_quote_by_id($quote_id)` directly without the `where_in('ip_quotes.client_id', $this->user_clients)` scoping that sibling methods use. A guest user assigned to one client can change another client's quote status by supplying sequential integer `quote_id` values, and `email_quote_status()` also sends notification emails. Additionally, `generate_pdf()` calls `mark_viewed($quote_id)` before checking the client scope, allowing a guest user to mark another client's quote as viewed. These issues are fixed in version 1.7.2-beta-1 and the subsequent stable version 1.7.2.
Related Weaknesses (CWE)
References
- https://github.com/InvoicePlane/InvoicePlane/commit/424dc44eb54030b93176bb08cba0
- https://github.com/InvoicePlane/InvoicePlane/commit/fca7792a24de0a749d881cbbe4af
- https://github.com/InvoicePlane/InvoicePlane/pull/1413
- https://github.com/InvoicePlane/InvoicePlane/pull/1471
- https://github.com/InvoicePlane/InvoicePlane/releases/tag/v1.7.2
- https://github.com/InvoicePlane/InvoicePlane/releases/tag/v1.7.2-beta-1
- https://github.com/InvoicePlane/InvoicePlane/security/advisories/GHSA-6xj3-274m-
FAQ
What is CVE-2026-55561?
CVE-2026-55561 is a documented vulnerability. InvoicePlane is a self-hosted open source application for managing invoices, clients, and payments. Prior to 1.7.2-beta-1, guest users can approve or reject quotes belonging to any client, not just th...
How severe is CVE-2026-55561?
CVSS scoring is not yet available for CVE-2026-55561. Check NVD for updates.
Is there a patch for CVE-2026-55561?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.