CVE-2026-34365 InvoiceShelf: SSRF in Estimate PDF Rendering via Unsanitised HTML in Notes Field
Attackers can exploit unsanitized HTML in estimate notes to trigger server-side requests, potentially accessing internal resources or bypassing network restrictions.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-34365?
CVE-2026-34365 is a high-severity server-side request forgery vulnerability in InvoiceShelf, published on 31 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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 Estimate PDF generation module. User-supplied HTML in the estimate 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 preview and customer view endpoints regardless of whether automated email attachments are enabled. This issue has been patched in version 2.2.0.
Weakness: CWE-918
Which versions are affected by CVE-2026-34365?
It affects 1 product.
Products include Invoiceshelf Invoiceshelf.
How do I fix CVE-2026-34365?
No fix has been published for CVE-2026-34365 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-34365 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34365 exists.
Other vulnerabilities in InvoiceShelf
Sources
Also known as GHSA-pc5v-8xwc-v9xq.