CVE-2026-23491 PoC — InvoicePlane has Unauthenticated Path Traversal in Guest Controller

Source

https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-23491.yaml

Associated Vulnerability

Title: InvoicePlane has Unauthenticated Path Traversal in Guest Controller (CVE-2026-23491)
Description:InvoicePlane is a self-hosted open source application for managing invoices, clients, and payments. A path traversal vulnerability exists in the `get_file` method of the `Guest` module's `Get` controller in InvoicePlane up to and including through 1.6.3. The vulnerability allows unauthenticated attackers to read arbitrary files on the server by manipulating the input filename. This leads to the disclosure of sensitive information, including configuration files with database credentials. Version 1.6.4 fixes the issue.

Description

InvoicePlane through 1.6.3 is vulnerable to an unauthenticated path traversal in the guest "Get::get_file()" controller. The supplied filename is passed to readfile() after a single urldecode() with no directory-traversal validation, allowing an unauthenticated attacker to read files outside the customer-files upload directory - including the application's own "ipconfig.php", which discloses the database credentials and the application ENCRYPTION_KEY. Fixed in 1.6.4 by the validate_file_access() helper.

File Snapshot

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