Quick answers
- Is CVE-2026-94039 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-94039 being exploited in the wild.
- How severe is CVE-2026-94039?
- High severity, with a CVSS score of 7.3, published 20 September 2026.
- Which products and versions are affected?
- Vas3k TaxHacker up to 0.8.5.
- Is there a fix for CVE-2026-94039?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-94039 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-94039?
- Check whether you run Vas3k TaxHacker at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The generateInvoicePDF server action in /apps/invoices/actions.ts lacks authentication checks and passes the businessLogo parameter unsanitized to the @react-pdf/renderer image resolver. The resolver treats absolute filesystem paths as local files (calling fs.readFile) and http/https URLs as remote resources (making fetch requests), enabling both local file read and server-side request forgery. The action is reachable without authentication via POST with a Next-Action header.
Affected products
- vas3k TaxHacker up to 0.8.5
Timeline
- 2026-08-26: disclosed: Security issue #186 reported on GitHub
- 2026-09-20: advisory: CVE-2026-94039 published