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CVE-2026-55561— InvoicePlane: Guest user IDOR in quote approval and rejection

Quick assessment

Affected
InvoicePlane InvoicePlane
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

InvoicePlane 是一款用于管理发票、客户和付款的自托管开源应用。在 1.7.2-beta-1 版本之前，访客用户不仅可以批准或拒绝分配给自己的客户的报价单，还可以操作其他客户的报价单。 中的访客报价控制器（Guest Quotes controller）的 和 方法，直接调用了 和 ，而缺少了同文件中其他兄弟方法所使用的 范围限制。因此，被分配给某一客户的访客用户，可以通过提供连续的整数 值来修改其他客户的报价单状态，同时 函数还会发送通知邮件。此外， 方法在检查客户范围之前就调用了 ，导致访客用户能够将

CVSS 5.3 · Medium
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I. Basic Information for CVE-2026-55561

Vulnerability Information
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Vulnerability Title
InvoicePlane: Guest user IDOR in quote approval and rejection
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
InvoicePlane InvoicePlane < 1.7.2-beta-1 -

II. Public POCs for CVE-2026-55561

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III. Intelligence Information for CVE-2026-55561

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Patches & Fixes for CVE-2026-55561 (4)

Vendor Advisories for CVE-2026-55561 (1)

Vendor Pages for CVE-2026-55561 (2)

IV. Related Vulnerabilities

Same product: InvoicePlane
Same vendor: InvoicePlane
Same weakness: CWE-639