Arbitrary file upload in CodeIgniter4 - CVE-2026-48062
Published: May 23, 2026
Vulnerability identifier: #VU132173
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-48062
CWE-ID: CWE-434
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to unrestricted upload of file with dangerous type in the ext_in upload validation rule when validating uploaded files. A remote attacker can upload a specially crafted file to execute arbitrary code.
Exploitation requires the application to accept user-controlled uploads, preserve the original client filename when saving the file, place the upload in a web-accessible directory, and allow executable files to run from that directory.
Affected software
CodeIgniter4
How to mitigate CVE-2026-48062
Install security update from vendor's website.
CodeIgniter4 - update to 4.7.3