Server-Side Request Forgery Vulnerability in vas3k TaxHacker Invoice PDF Renderer
CVE-2026-94039

6.9MEDIUM

Key Information:

Vendor

Vas3k

Status
Taxhacker
Vendor
CVE Published:
20 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-94039?

A vulnerability in the Invoice PDF Renderer of vas3k TaxHacker, affecting versions up to 0.8.5, allows attackers to manipulate the businessLogo argument in the generateInvoicePDF function. This manipulation can lead to server-side request forgery, enabling malicious actors to send unauthorized requests from the server. The potential for remote exploitation has been confirmed, and the exploit is now publicly available. Despite early notifications to the project maintainers regarding this issue, no response has been recorded.

Affected Version(s)

TaxHacker 0.8.0

TaxHacker 0.8.1

TaxHacker 0.8.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-94039 - Proof of Concept

References

https://vuldb.com/vuln/407968
vdb-entrytechnical-description
https://vuldb.com/vuln/407968/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-94039
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

CAPT (VulDB User)
VulDB CNA Team
.