InvoiceShelf up to 2.3.9 ConvertEstimateController improper authorization

Summaryinfo

A vulnerability categorized as critical has been discovered in InvoiceShelf up to 2.3.9. This issue affects some unknown processing of the component ConvertEstimateController. Executing a manipulation can lead to improper authorization. This vulnerability appears as CVE-2026-55381. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in InvoiceShelf up to 2.3.9 and classified as critical. This vulnerability affects an unknown functionality of the component ConvertEstimateController. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect 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 2.4.0, POST /api/v1/estimates/{estimate}/convert-to-invoice in ConvertEstimateController authorizes only the caller's create-invoice ability and does not authorize access to the route-bound Estimate. Because route-model binding can resolve an estimate from any company, an authenticated user with create-invoice ability can copy another company's line items, prices, totals, taxes, notes, currency, and customer data into an invoice in the attacker's company. The victim company's configured conversion action reaches checkForEstimateConvertAction and can also change or delete the original estimate. This issue is fixed in version 2.4.0.

The advisory is available at github.com. This vulnerability was named CVE-2026-55381 since 06/16/2026. The exploitation appears to be easy. The attack can be initiated remotely. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

Upgrading to version 2.4.0 eliminates this vulnerability.

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Productinfo

Name

• InvoiceShelf

Version

• 2.3.0
• 2.3.1
• 2.3.2
• 2.3.3
• 2.3.4
• 2.3.5
• 2.3.6
• 2.3.7
• 2.3.8
• 2.3.9

Website

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

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