Summaryinfo

A vulnerability described as critical has been identified in InvoiceShelf up to 2.1.x. This impacts an unknown function of the component Email Attachment Handler. Such manipulation of the argument Payment Notes leads to server-side request forgery. This vulnerability is documented as CVE-2026-34366. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in InvoiceShelf up to 2.1.x and classified as critical. Affected by this issue is an unknown code block of the component Email Attachment Handler. The manipulation of the argument Payment Notes with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. CVE summarizes:

InvoiceShelf is an open-source web & mobile app that helps track expenses, payments and create professional invoices and estimates. Prior to version 2.2.0, a Server-Side Request Forgery (SSRF) vulnerability exists in the Payment receipt PDF generation module. User-supplied HTML in the payment Notes field is passed unsanitised to the Dompdf rendering library, which will fetch any remote resources referenced in the markup. The vulnerability is exploitable directly via the PDF receipt endpoint, regardless of whether automated email attachments are enabled. This issue has been patched in version 2.2.0.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-34366 since 03/27/2026. The exploitation is known to be easy. The attack may be launched remotely. The exploitation needs additional levels of successful authentication. Technical details are known, but there is no available exploit.

Upgrading to version 2.2.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• InvoiceShelf

Version

• 2.0
• 2.1

Website

• Product: https://github.com/InvoiceShelf/InvoiceShelf/

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