CodeIgniter4 allows spoofing of IP address when using proxy

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

7.0 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L

EPSS

• CVE-2022-23556: 0.40% estimated exploitation activity in the next 30 days; percentile 34.08 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact This vulnerability may allow attackers to spoof their IP address when your server is behind a reverse proxy. Patches Upgrade to v4.2.11 or later, and configure Config\App::$proxyIPs. Workarounds Do not use $request-getIPAddress(). References - https://codeigniter4.github.io/userguide/incoming/request.html#CodeIgniter\HTTP\Request::getIPAddress For more information If you have any questions or comments about this advisory: Open an issue in codeigniter4/CodeIgniter4 Email us at SECURITY.md

Published by the source

22 Dec 2022, 19:59 UTC

Last modified by the source

1 Feb 2023, 05:01 UTC

Source last checked

26 Oct 2026, 14:00 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-ghw3-5qvm-3mqc

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# Patch Next advisory brief: CVE-2022-23556

Advisory: CodeIgniter4 allows spoofing of IP address when using proxy
IDs: CVE-2022-23556, GHSA-ghw3-5qvm-3mqc
Record: https://patchnext.com/advisories/cve-2022-23556 (revision 1, source checked 26 Oct 2026, 14:00 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: codeigniter4/framework 4.2.11. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist codeigniter4/framework: affected < 4.2.11; fixed in 4.2.11

## Suggested inspection (read-only)
- Packagist codeigniter4/framework: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on codeigniter4/framework.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-ghw3-5qvm-3mqc (GitHub-reviewed advisory GHSA-ghw3-5qvm-3mqc lists affected ranges: Packagist codeigniter4/framework >=0 <4.2.11)

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