Use of Less Trusted Source in CodeIgniter4 - CVE-2026-63220
Published: July 7, 2026
Vulnerability identifier: #VU137011
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-63220
CWE-ID: CWE-348
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass HTTPS-only security checks.
The vulnerability exists due to use of less trusted source in IncomingRequest::isSecure() when handling client-supplied forwarded HTTPS headers. A remote attacker can send a request with spoofed X-Forwarded-Proto or Front-End-Https headers to bypass HTTPS-only security checks.
Exploitation depends on deployment configuration and is more likely when the backend is directly reachable over HTTP or when a reverse proxy forwards client-supplied forwarding headers without stripping or overwriting them.
Affected software
CodeIgniter4
How to mitigate CVE-2026-63220
Install security update from vendor's website.
CodeIgniter4 - update to 4.7.4