What’s Vulnerable › Vulnerabilities

CVE-2026-34366: InvoiceShelf: SSRF in Payment Receipt PDF Rendering via Unsanitised HTML in Notes Field

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-31 · updated 2026-07-24
• Weakness: CWE-918

Description

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.

Affected products

• InvoiceShelf: before 2.2.0 — fixed in 2.2.0

How to fix

Upgrade to a fixed version: InvoiceShelf 2.2.0. Check the vendor advisory for mitigations.

References

• https://github.com/InvoiceShelf/InvoiceShelf/releases/tag/2.2.0
• https://github.com/InvoiceShelf/InvoiceShelf/security/advisories/GHSA-38hf-fq8x-q49r

Get alerted when CVE-2026-34366 or the next vulnerability affects your stack