{"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","slug":"CVE-2026-55561","body":"## Overview\n\nInvoicePlane 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.\n\n## Affected\n\n- `InvoicePlane < 1.7.2-beta-1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}