What’s Vulnerable › Vulnerabilities

CVE-2022-21715: Cross-site Scripting Vulnerability in CodeIgniter4

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-01-24 · updated 2026-06-17
• Weakness: CWE-79

Description

CodeIgniter4 is the 4.x branch of CodeIgniter, a PHP full-stack web framework. A cross-site scripting (XSS) vulnerability was found in `API\ResponseTrait` in Codeigniter4 prior to version 4.1.8. Attackers can do XSS attacks if a potential victim is using `API\ResponseTrait`. Version 4.1.8 contains a patch for this vulnerability. There are two potential workarounds available. Users may avoid using `API\ResponseTrait` or `ResourceController` Users may also disable Auto Route and use defined routes only.

Affected products

• CodeIgniter4: from 4.0.0 before 4.1.8 — fixed in 4.1.8

How to fix

Upgrade to a fixed version: CodeIgniter4 4.1.8. Check the vendor advisory for mitigations.

References

• https://codeigniter4.github.io/userguide/incoming/routing.html#use-defined-routes-only
• https://github.com/codeigniter4/CodeIgniter4/commit/70d881cf5322b7c32e69516aebd2273ac6a1e8dd
• https://github.com/codeigniter4/CodeIgniter4/security/advisories/GHSA-7528-7jg5-6g62
• https://codeigniter4.github.io/userguide/incoming/routing.html#use-defined-routes-only
• https://github.com/codeigniter4/CodeIgniter4/commit/70d881cf5322b7c32e69516aebd2273ac6a1e8dd
• https://github.com/codeigniter4/CodeIgniter4/security/advisories/GHSA-7528-7jg5-6g62

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