SSRF in Invoiceshelf
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (26.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.001
Affected products
- Invoiceshelf — versions < 2.2.0
Weakness classification (CWE)
References
- github.com/InvoiceShelf/InvoiceShelf/security/advisories/GHSA-38hf-fq8x-q49r (Exploit, Vendor Advisory)
- github.com/InvoiceShelf/InvoiceShelf/releases/tag/2.2.0 (Product)
Frequently asked questions
- What is CVE-2026-34366?
- CVE-2026-34366 is a high-severity vulnerability in Invoiceshelf, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.6/10. Published 2026-03-31.
- How severe is CVE-2026-34366?
- High severity. CVSS v3 base score is 7.6 out of 10.