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

Critical 9.3 Published 18 Feb 2026 Updated 25 Feb 2026

Unauthenticated attackers can read arbitrary files, including database credentials, via path traversal in the Guest controller.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-23491?

CVE-2026-23491 is a critical path traversal vulnerability in InvoicePlane, published on 18 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-22

Which versions are affected by CVE-2026-23491?

It affects 1 product.

Products include Invoiceplane Invoiceplane.

How do I fix CVE-2026-23491?

No fix has been published for CVE-2026-23491 yet. Limit exposure of the affected software until one is available.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2026-23491 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-23491 exists.

Public exploit code: 1 Nuclei template and 1 proofs of concept on GitHub.

Sources

Also known as GHSA-88gq-mv54-v3fc.