Deserialization of Untrusted Data in Codeigniter4

CRITICAL 9.8CVE-2022-21647 · BIT-codeigniter-2022-21647 · GHSA-w6jr-wj64-mc9x · Published 04/01/2022 · updated 17/06/2026

Package	Affected versions	Patched versions
codeigniter4/framework Packagist	`< 4.1.6`	`4.1.6`
codeigniter codeigniter	`≥ 4.0.0, < 4.1.6`	`4.1.6`

Description

Impact

Deserialization of Untrusted Data was found in the old() function in CodeIgniter4. Remote attackers may inject auto-loadable arbitrary objects with this vulnerability, and possibly execute existing PHP code on the server. We are aware of a working exploit, which can lead to SQL injection.

Patches

Upgrade to v4.1.6 or later.

Workarounds

Do not use:

old() and form_helper
RedirectResponse::withInput() and redirect()->withInput()

References

PHP Object Injection | OWASP

For more information

If you have any questions or comments about this advisory:

Open an issue in codeigniter4/CodeIgniter4
Email us at SECURITY.md

NVD description

CodeIgniter is an open source PHP full-stack web framework. Deserialization of Untrusted Data was found in the `old()` function in CodeIgniter4. Remote attackers may inject auto-loadable arbitrary objects with this vulnerability, and possibly execute existing PHP code on the server. We are aware of a working exploit, which can lead to SQL injection. Users are advised to upgrade to v4.1.6 or later. Users unable to upgrade as advised to not use the `old()` function and form_helper nor `RedirectResponse::withInput()` and `redirect()->withInput()`.

References

codeigniter4/CodeIgniter4 security advisory · WEB
nvd.nist.gov/vuln/detail/CVE-2022-21647 · ADVISORY
codeigniter4/CodeIgniter4 commit ce95ed5 · WEB
FriendsOfPHP/security-advisories · WEB
codeigniter4/CodeIgniter4 · PACKAGE

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Package

Affected versions

Patched versions

codeigniter4/framework

Packagist

< 4.1.6

4.1.6

codeigniter

≥ 4.0.0, < 4.1.6

4.1.6

Description

Impact

Patches

Upgrade to v4.1.6 or later.

Workarounds

Do not use:

old() and form_helper
RedirectResponse::withInput() and redirect()->withInput()

References

PHP Object Injection | OWASP

For more information

If you have any questions or comments about this advisory:

Open an issue in codeigniter4/CodeIgniter4
Email us at SECURITY.md

NVD description