What is CVE-2022-23556?

CVE-2022-23556 is a high-severity vulnerability in Codeigniter, classified under Insufficient Verification of Data Authenticity. CVSS score: 7.0/10. Published 2022-12-22.

How severe is CVE-2022-23556?

High severity. CVSS v3 base score is 7.0 out of 10.

Vulnerability in Codeigniter

CVE-2022-23556

CodeIgniter is a PHP full-stack web framework. This vulnerability may allow attackers to spoof their IP address when the server is behind a reverse proxy. This issue has been patched, please upgrade to version 4.2.11 or later, and configure `Config\App::$proxyIPs`. As a workaround, do not use `$request->getIPAddress()`.

Published 2022-12-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L.

EPSS exploit prediction

EPSS: 0.004 (28.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Codeigniter
Codeigniter4 — versions < 4.2.11

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

github.com/codeigniter4/CodeIgniter4/security/advisories/GHSA-ghw3-5qvm-3mqc (Exploit, Third Party Advisory)
github.com/codeigniter4/CodeIgniter4/commit/5ca8c99b2db09a2a08a013836628028ddc9… (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2022-23556?: CVE-2022-23556 is a high-severity vulnerability in Codeigniter, classified under Insufficient Verification of Data Authenticity. CVSS score: 7.0/10. Published 2022-12-22.
How severe is CVE-2022-23556?: High severity. CVSS v3 base score is 7.0 out of 10.