Is CVE-2026-34366 actively exploited?

No active exploitation of CVE-2026-34366 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34366 be exploited remotely?

Yes. CVE-2026-34366 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-34366?

CVE-2026-34366 has a CVSS score of 8.1 (HIGH).

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HIGH

CVE-2026-34366

CWE-918Published: March 31, 2026· Updated: Apr 7, 2026

8.1

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:7.2th

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 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.

NVD Source

Technical Analysis

CVE-2026-34366 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 8.1.