CVE-2026-26281 InvoicePlane has Stored Cross-Site Scripting (XSS) Issue in Sumex Invoice View

Medium 4.4 Published 18 Feb 2026 Updated 19 Feb 2026

Authenticated users can inject malicious scripts into invoice views, allowing attackers to hijack sessions or steal data from other users.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-26281?

CVE-2026-26281 is a medium-severity cross-site scripting vulnerability in InvoicePlane, published on 18 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

InvoicePlane is a self-hosted open source application for managing invoices, clients, and payments. A stored cross-site scripting (XSS) vulnerability in the Sumex invoice view allows an authenticated user with client and invoice management privileges to execute arbitrary JavaScript in the browser of any user viewing the invoice. This can lead to session hijacking, data theft, or other malicious actions on behalf of the victim user. Version 1.7.1 patches the issue.

Weakness: CWE-79

Which versions are affected by CVE-2026-26281?

It affects 1 product.

Products include Invoiceplane Invoiceplane.

How do I fix CVE-2026-26281?

No fix has been published for CVE-2026-26281 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-26281 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-26281 exists.

Sources

Also known as GHSA-ccpx-2v5c-cc24.