What is CVE-2026-48062?

CVE-2026-48062 is a critical-severity vulnerability in Codeigniter4, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-07-17.

How severe is CVE-2026-48062?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Arbitrary file upload in Codeigniter4

CVE-2026-48062

CodeIgniter is a PHP full-stack web framework. Prior to 4.7.3, the ext_in upload validation rule in system/Validation/StrictRules/FileRules.php checked the MIME-derived guessed extension instead of the client-provided filename extension. A…

Vulnerability class: Unrestricted File Upload

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Codeigniter4 — versions < 4.7.3

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-48062?: CVE-2026-48062 is a critical-severity vulnerability in Codeigniter4, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-07-17.
How severe is CVE-2026-48062?: Critical severity. CVSS v3 base score is 9.8 out of 10.