What is CVE-2026-4809?

CVE-2026-4809 is a critical-severity vulnerability in Plank Laravel-Mediable, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-03-26.

How severe is CVE-2026-4809?

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

Arbitrary file upload in Plank Laravel-Mediable

CVE-2026-4809

plank/laravel-mediable through version 6.4.0 can allow upload of a dangerous file type when an application using the package accepts or prefers a client-supplied MIME type during file upload handling. In that configuration, a remote attacker can submit a file containing executable PHP code while declaring a benign image MIME type, resulting in arbitrary file upload.

Vulnerability class: Unrestricted File Upload

EPSS: 0.013 (67.0th percentile) — read the EPSS interpretation.

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

Plank Laravel-mediable — versions <= 6.4.0

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)
309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)

Frequently asked questions

What is CVE-2026-4809?: CVE-2026-4809 is a critical-severity vulnerability in Plank Laravel-Mediable, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-03-26.
How severe is CVE-2026-4809?: Critical severity. CVSS v3 base score is 9.8 out of 10.