Variable Extraction Error in CodeIgniter4 - #VU155855
Published: October 15, 2026
Vulnerability identifier: #VU155855
CSH Severity: Low
CVSS v4: 7.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-621
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary PHP code.
The vulnerability exists due to variable extraction errors in Parser::render() and Parser::renderString() when extracting less-trusted view data into the same scope as internal variables. A remote user can supply a colliding template key containing PHP code to replace the trusted template before evaluation to execute arbitrary PHP code.
Exploitation requires application-controlled data handling that permits less-trusted input to determine view data keys and values. The original template need not reference {template}, and escaping PHP tags in the original template does not prevent execution of PHP tags in the replacement value.
Affected software
CodeIgniter4
Remediation
Install security update from vendor's website.
CodeIgniter4 - update to 4.7.5