---
id: CVE-2026-55561
title: 'InvoicePlane: Guest user IDOR in quote approval and rejection'
summary: >-
  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()`…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-639
vendor: InvoicePlane
product: InvoicePlane
affected:
  - InvoicePlane < 1.7.2-beta-1
published: '2026-10-28'
updated: '2026-10-28'
sourceUpdated: '2026-10-28T22:33:47.140Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-55561'
references:
  - url: >-
      https://github.com/InvoicePlane/InvoicePlane/security/advisories/GHSA-6xj3-274m-4mvg
    label: >-
      https://github.com/InvoicePlane/InvoicePlane/security/advisories/GHSA-6xj3-274m-4mvg
  - url: 'https://github.com/InvoicePlane/InvoicePlane/pull/1413'
    label: 'https://github.com/InvoicePlane/InvoicePlane/pull/1413'
  - url: 'https://github.com/InvoicePlane/InvoicePlane/pull/1471'
    label: 'https://github.com/InvoicePlane/InvoicePlane/pull/1471'
  - url: >-
      https://github.com/InvoicePlane/InvoicePlane/commit/424dc44eb54030b93176bb08cba07ba12d7ae451
    label: >-
      https://github.com/InvoicePlane/InvoicePlane/commit/424dc44eb54030b93176bb08cba07ba12d7ae451
  - url: >-
      https://github.com/InvoicePlane/InvoicePlane/commit/fca7792a24de0a749d881cbbe4af6f58e9545d20
    label: >-
      https://github.com/InvoicePlane/InvoicePlane/commit/fca7792a24de0a749d881cbbe4af6f58e9545d20
  - url: 'https://github.com/InvoicePlane/InvoicePlane/releases/tag/v1.7.2'
    label: 'https://github.com/InvoicePlane/InvoicePlane/releases/tag/v1.7.2'
  - url: 'https://github.com/InvoicePlane/InvoicePlane/releases/tag/v1.7.2-beta-1'
    label: 'https://github.com/InvoicePlane/InvoicePlane/releases/tag/v1.7.2-beta-1'
tags:
  - cve.org
epss: 0.00275
epssPercentile: 0.1993
ingestedAt: '2026-10-30T21:09:21.618Z'
---

## Overview

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.

## Affected

- `InvoicePlane < 1.7.2-beta-1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.