Origin Validation Error in rathena FluxCP's PayPal IPN Handler
CVE-2026-116254

6.9MEDIUM

Key Information:

Vendor

Rathena

Status
Fluxcp
Vendor
CVE Published:
26 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-116254?

A vulnerability exists in rathena FluxCP affecting the PayPal IPN Handler, specifically in the function responsible for verifying IP ranges. The issue stems from improper validation of the X-Real-IP argument, resulting in an origin validation error. This flaw can be exploited remotely, allowing an attacker to manipulate the incoming requests without the necessary checks in place. The exploit is publicly available, and despite prior notification to the vendor, there has been no response regarding the resolution of this vulnerability.

Affected Version(s)

FluxCP 98cd4b8fd83228c11b36fb3d097b8e0f7c105a8d

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-2026-116254 - Proof of Concept

References

https://vuldb.com/vuln/426288
vdb-entrytechnical-description
https://vuldb.com/vuln/426288/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-116254
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
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

qianqiu (VulDB User)
VulDB CNA Team
.