InvoicePlane up to 1.7.2-beta-0 Guest Quotes Controller Quotes.php quote_id authorization

Summaryinfo

A vulnerability marked as critical has been reported in InvoicePlane up to 1.7.2-beta-0. Impacted is the function approve_quote_by_id/reject_quote_by_id/email_quote_status/generate_pdf of the file application/modules/guest/controllers/Quotes.php of the component Guest Quotes Controller. This manipulation of the argument quote_id causes authorization. This vulnerability is tracked as CVE-2026-55561. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in InvoicePlane up to 1.7.2-beta-0. Affected by this vulnerability is the function approve_quote_by_id/reject_quote_by_id/email_quote_status/generate_pdf of the file application/modules/guest/controllers/Quotes.php of the component Guest Quotes Controller. The manipulation of the argument quote_id with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. 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. 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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-55561 since 06/17/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available.

By approaching the search of inurl:application/modules/guest/controllers/Quotes.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 1.7.2-beta-1 or 1.7.2 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• InvoicePlane

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7.2-beta-0

Website

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

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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