# CVE-2026-55610: InvoiceShelf cross-tenant user account takeover via authorization bypass

Source: https://junglewise.ai/threats/cve-2026-55610-invoiceshelf-is-an-open-source-web-mobile-app-that-helps-track  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-23. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-55610 · Severity: high · CVSS 8.7 · Published 2026-09-23

InvoiceShelf is an open-source invoicing and expense-tracking application used by businesses to manage multiple company accounts. In multi-company installations prior to version 2.4.1, a company owner can read and modify any user account across all other companies, including changing passwords and email addresses. This allows attackers to completely take over user accounts and steal sensitive data across company boundaries.

Technologies: [Invoiceshelf](https://junglewise.ai/threats/technologies/invoiceshelf). Vendors: [Invoiceshelf](https://junglewise.ai/threats/vendors/invoiceshelf).

## Quick answers

**Is CVE-2026-55610 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-55610 being exploited in the wild.

**How severe is CVE-2026-55610?** High severity, with a CVSS score of 8.7, published 23 September 2026.

**Which products and versions are affected?** Invoiceshelf prior to 2.4.1.

**Is there a fix for CVE-2026-55610?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-55610 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-55610?** Check whether you run Invoiceshelf at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an insecure direct object reference (IDOR) in the /api/v1/users/{user} GET and PUT endpoints. The UserPolicy authorization checks only verify that the requester is an owner of their own company header, but never confirm that the target user belongs to the same company. Route-model binding resolves users by global primary key without company-scoping, allowing owners to read email and company associations, and modify passwords and company assignments for any user across tenants.

## Affected products

- InvoiceShelf InvoiceShelf prior to 2.4.1

## Timeline

- 2026-09-23: disclosed

## References

- [https://github.com/InvoiceShelf/InvoiceShelf/security/advisories/GHSA-vgx6-6cqr-m8qr](https://github.com/InvoiceShelf/InvoiceShelf/security/advisories/GHSA-vgx6-6cqr-m8qr)

## Related threats

- [InvoiceShelf improper access control in member company assignment](https://junglewise.ai/threats/cve-2026-122158-a-security-flaw-has-been-discovered-in-invoiceshelf-up-to-2-4-3)
- [InvoiceShelf server-side request forgery in PDF generation](https://junglewise.ai/threats/cve-2026-55385-invoiceshelf-is-an-open-source-web-mobile-app-that-helps-track)
- [InvoiceShelf SSRF in Invoice PDF generation module](https://junglewise.ai/threats/cve-2026-34367-invoiceshelf-ssrf-in-invoice-pdf-generation-module)
- [InvoiceShelf SSRF in payment receipt PDF generation](https://junglewise.ai/threats/cve-2026-34366-invoiceshelf-ssrf-in-payment-receipt-pdf-generation)
- [InvoiceShelf SSRF in Estimate PDF generation module](https://junglewise.ai/threats/cve-2026-34365-invoiceshelf-ssrf-in-estimate-pdf-generation-module)