CVE-2026-116254 Details
Description
A vulnerability was identified in rathena FluxCP up to 98cd4b8fd83228c11b36fb3d097b8e0f7c105a8d. This issue affects the function verifyiprange of the file lib/Flux/PaymentNotifyRequest.php of the component PayPal IPN Handler. The manipulation of the argument X-Real-IP leads to origin validation error. The attack is possible to be carried out remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
A vulnerability exists in rAthena FluxCP versions prior to commit 98cd4b8fd83228c11b36fb3d097b8e0f7c105a8d, specifically within the PayPal IPN Handler. The issue arises in the function verifyiprange of the file lib/Flux/PaymentNotifyRequest.php. This vulnerability allows remote attackers to manipulate the X-Real-IP header, bypass origin validation, and exploit the system. The endpoint is unauthenticated and designed to accept PayPal IPN notifications, creating a risk of unauthorized actions on user accounts.
To address this vulnerability, validate the peer identity using REMOTE_ADDR only, unless a trusted-proxy chain is explicitly configured. Require verification of PayPal transactions on all gate paths, persist verified transactions server-side to prevent double crediting, and treat the custom parameter as untrusted input by avoiding unserialize() and accepting only strict JSON schemas.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 26, 2026CISA-ADP
Assessed Oct 31, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://gist.github.com/qianqiusujiu/2a57c3721116efc6fe7c20b41ad68a5d | [email protected] | ExploitTechnical Analysis |
| https://vuldb.com/cve/CVE-2026-116254 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/1009729 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/426288 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/426288/cti | [email protected] | AdvisoryPermission Required |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-345 | Insufficient Verification of Data Authenticity | [email protected] |
| CWE-346 | Origin Validation Error | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| rathena FluxCP | master branch, commit 98cd4b8 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 31, 2026 | CVE Modified | CISA-ADP |
| Oct 26, 2026 | New CVE Received | [email protected] |