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Vulnerability record · CVE-2022-21647 · published 4 January 2022

CVE-2022-21647: Codeigniter deserialization of untrusted data vulnerability

Codeigniter · Codeigniter

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()`.

9.8 CVSS 3.1 Critical EPSS 38% · top 1.5% CWE-502 · Deserialization of untrusted data
9.8CVSS 3.1 base score, v2 7.5
38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by 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()`.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/codeigniter4/CodeIgniter4/commit/ce95ed5765256e2f09f3513e7d42790e0d6948f5 PatchThird Party Advisory
https://github.com/codeigniter4/CodeIgniter4/security/advisories/GHSA-w6jr-wj64-mc9x MitigationThird Party Advisory
https://github.com/codeigniter4/CodeIgniter4/commit/ce95ed5765256e2f09f3513e7d42790e0d6948f5 PatchThird Party Advisory
https://github.com/codeigniter4/CodeIgniter4/security/advisories/GHSA-w6jr-wj64-mc9x MitigationThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2022-21647), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.