How severe is CVE-2026-34366?

CVE-2026-34366 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2026-34366 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34366?

CVE-2026-34366 affects Invoiceshelf. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34366?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-34366 have an EU (EUVD) identifier?

Yes. CVE-2026-34366 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17616.

When was CVE-2026-34366 published?

CVE-2026-34366 was published on 2026-03-31 and last updated on 2026-06-17.

CVE-2026-34366

CVE-2026-34366 is a high-severity vulnerability in Invoiceshelf with a CVSS 3.x base score of 7.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: High (CVSS 3.x base score 7.6)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17616
Weakness: CWE-918
Affected product: Invoiceshelf
Published: 2026-03-31
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-34366?: 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.
How severe is CVE-2026-34366?: CVE-2026-34366 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2026-34366 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34366?: CVE-2026-34366 affects Invoiceshelf. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34366?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-34366 have an EU (EUVD) identifier?: Yes. CVE-2026-34366 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17616.
When was CVE-2026-34366 published?: CVE-2026-34366 was published on 2026-03-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:invoiceshelf:invoiceshelf:*:*:*:*:*:*:*:*

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