How severe is CVE-2022-23556?

CVE-2022-23556 has a CVSS score of 7/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2022-23556?

CVE-2022-23556 affects the following packages: codeigniter4/framework (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2022-23556?

Update codeigniter4/framework to 4.2.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-23556 is resolved across your whole dependency graph.

How do I detect CVE-2022-23556 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for codeigniter4/framework, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2022-23556 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2022-23556 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2022-23556, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2022-23556?

CVE-2022-23556 has an EPSS (Exploit Prediction Scoring System) score of 0.4%, placing it in the 34th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2022-23556?

CVE-2022-23556 is classified as CWE-345 (CWE-345). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2022-23556 published, and has it been updated?

CVE-2022-23556 was published on December 22, 2022 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘

🐘 Packagist

Not in CISA KEV

HIGH severity

CVE-2022-23556 — framework

HIGHFix: codeigniter4/CodeIgniter4@5ca8c99

CVE-2022-23556 is a high-severity (CVSS 7) CWE-345 vulnerability in codeigniter4/framework. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for codeigniter4/framework — see the affected versions and patch details below.

CodeIgniter is vulnerable to IP address spoofing when using proxy

Also known asBIT-codeigniter-2022-23556GHSA-ghw3-5qvm-3mqc

Published

Dec 22, 2022

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

1 known

Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2022-23556.

EPSS Exploitation Probability

via FIRST.org ↗

0.4%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs34th percentile — riskier than 34% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

🐘codeigniter4/framework

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`codeigniter4/framework`	all versions	4.2.11`composer require codeigniter4/framework:^4.2.11`

Affected Products

1 product · 1 configurations

Application

codeignitercodeigniter

≥ 4.0.0 && < 4.2.11

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

CodeIgniter is a PHP full-stack web framework. This vulnerability may al…

github.comNVDDec 2022

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for codeigniter4/framework, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update codeigniter4/framework to 4.2.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-23556 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### 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](https://github.com/codeigniter4/CodeIgniter4/issues) * Email us at [SECURITY.md](https://gi