TI-2026-74461 Aliases CVE-2026-55385

Server-side request forgery in InvoiceShelf PDF configuration

MEDIUM 63CWE-918Published 2026-10-14 · Updated 2026-10-20

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.

Summary

InvoiceShelf versions before 2.4.0 are affected. The PDF configuration checks the Gotenberg host setting only for valid URL syntax, so PDF rendering can be sent to private, loopback, link-local or reserved addresses (CWE-918). A user with high privileges, such as an account owner, can use PDF generation to reach internal services or cloud metadata endpoints, and a configured external host receives customer and invoice data from later renders.

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, InvoiceShelf's PDFConfigurationRequest.php validates the owner-controlled gotenberg_host setting only as a syntactically valid URL. GotenbergPDFDriver::loadView later sends a multipart HTTP request containing rendered invoice, estimate, or payment HTML as document.html to that host without rejecting private, loopback, link-local, or reserved addresses. An owner can use PDF generation to reach internal services or cloud metadata endpoints, and a configured external host receives customer names, addresses, line items, totals, and company identifiers from subsequent PDF renders. This issue is fixed in version 2.4.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00576 47th 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 issue.

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-2026-55385
2026-10-16 Priority changed: MEDIUM → LOW
2026-10-20 CISA SSVC decision points changed
2026-10-20 Priority changed: LOW → MEDIUM

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