TI-2026-74457 Aliases CVE-2026-55381

Missing access check in InvoiceShelf estimate conversion

MEDIUM 64CWE-639Published 2026-10-14 · Updated 2026-10-15

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

InvoiceShelf before 2.4.0 has an authorization flaw (CWE-639) in the estimate to invoice conversion endpoint. The endpoint checks only the caller's invoice creation permission and does not check access to the estimate itself. An authenticated user with invoice creation permission can copy another company's estimate line items, prices, totals, customer data and currency into an invoice in their own company. The victim company's conversion action can also change or delete the original estimate.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00364 30th percentileScored 2026-11-07

Fix Fixed InvoiceShelf (InvoiceShelf): 2.4.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
InvoiceShelf	InvoiceShelf	before 2.4.0	2.4.0	Patch available	CNA

InvoiceShelf VendorInvoiceShelf Affected before 2.4.0 Fixed in 2.4.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:invoiceshelf:invoiceshelf::::::::	—	—	InvoiceShelf

cpe:2.3:a:invoiceshelf:invoiceshelf:*:*:*:*:*:*:*:* Versions — — ·InvoiceShelf

Remediation

Upgrade InvoiceShelf to version 2.4.0, which fixes the flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Fix · CNA InvoiceShelf (InvoiceShelf) Fixed in 2.4.0

Timeline

2026-10-15 Threatist record created from CVE-2026-55381
2026-10-16 CISA SSVC decision points changed

References

Other 4

TI-2026-74459 InvoiceShelf: Public EmailLog token type confusion allows cross-company invoice disclosure CVSS 3.1HIGH 8.2
TI-2026-26653 InvoiceShelf: SSRF in Invoice PDF Rendering via Unsanitised HTML in Notes Field CVSS 3.1HIGH 8.7
TI-2026-26652 InvoiceShelf: SSRF in Payment Receipt PDF Rendering via Unsanitised HTML in Notes Field CVSS 3.1HIGH 8.1
TI-2026-26651 InvoiceShelf: SSRF in Estimate PDF Rendering via Unsanitised HTML in Notes Field CVSS 3.1HIGH 8.1
TI-2026-74463 InvoiceShelf bulk deletion lets users delete other companies' records CVSS 4.0HIGH 7.2
TI-2026-74462 SQL injection in InvoiceShelf ORDER BY clause exposes database data CVSS 4.0HIGH 7.1

See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences