Server-Side Request Forgery Vulnerability in Invoice Ninja by Invoice Ninja
CVE-2026-83744

5.3MEDIUM

Key Information:

Vendor

Invoiceninja

Status
Invoice Ninja
Vendor
CVE Published:
1 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-83744?

A security vulnerability exists in the Invoice Ninja application up to version 5.13.26, specifically in the Purify::isHostSafe function located in the app/Services/Pdf/Purify.php file. This flaw allows an attacker to manipulate the 'notes' argument, potentially leading to remote server-side request forgery (SSRF) exploits. The vulnerability has been disclosed and publicly discussed, raising concerns regarding its exploitability. Despite being notified, the vendor's lack of response exacerbates the risk to users relying on affected versions of the software.

Affected Version(s)

Invoice Ninja 5.13.0

Invoice Ninja 5.13.1

Invoice Ninja 5.13.2

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-2026-83744 - Proof of Concept

References

https://vuldb.com/vuln/397500
vdb-entrytechnical-description
https://vuldb.com/vuln/397500/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-83744
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
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

MAVERICK-VF142 (VulDB User)
VulDB CNA Team
.