CVE-2026-34367: InvoiceShelf: SSRF in Invoice PDF Rendering via Unsanitised HTML in Notes Field
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 Invoice PDF generation module. User-supplied HTML in the invoice Notes field is passed unsanitised to the Dompdf rendering library, which will fetch any remote resources referenced in the markup. This can be triggered via the PDF preview and email delivery endpoints. This issue has been patched in version 2.2.0.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
InvoiceShelfto a version that resolves this vulnerability.Fixed in 2.2.0 - Compensating control
Until updated, restrict access to the Invoice PDF preview and email delivery endpoints so untrusted users cannot trigger PDF generation/preview that renders user-supplied HTML in the invoice Notes field.
Event History
Frequently Asked Questions
What is the severity of CVE-2026-34367?
CVE-2026-34367 has been classified as a critical vulnerability due to the potential for Server-Side Request Forgery (SSRF).
How do I fix CVE-2026-34367?
To fix CVE-2026-34367, upgrade to InvoiceShelf version 2.2.0 or later, which addresses the SSRF vulnerability.
What is the impact of CVE-2026-34367?
CVE-2026-34367 allows attackers to exploit the InvoiceShelf application to perform unauthorized requests on behalf of the server, potentially leading to data exfiltration or further attacks.
What products are affected by CVE-2026-34367?
CVE-2026-34367 affects InvoiceShelf versions prior to 2.2.0.
Is CVE-2026-34367 being actively exploited?
As of now, there is no confirmed active exploitation reported for CVE-2026-34367, but it is advisable to patch the vulnerability immediately.