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CVE-2026-34366

Invoiceshelf server-side request forgery (SSRF)

7.6 HIGHPublic exploitEPSS 0.35%
  1. Published31 Mar 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredHigh
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N

Affected products

Invoiceshelf< 2.2.0

Remediation

Fixed in
Invoiceshelf≥ 2.2.0

References

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Frequently asked

Is CVE-2026-34366 being actively exploited?

CVE-2026-34366 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.35%.

How severe is CVE-2026-34366?

CVE-2026-34366 has a CVSS 3.1 base score of 7.6, rated high. EPSS estimates a 0.35% probability of exploitation.

Which products are affected by CVE-2026-34366?

Affected products include Invoiceshelf.

How do I fix CVE-2026-34366?

Upgrade affected software to a fixed version, for example Invoiceshelf 2.2.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34366 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.