CVE-2026-105123 HIGH

CVE-2026-105123: W (wcms) through 3.18.0 RCE and Arbitrary File Write via Media Upload API

Vendor Vincent-Peugnet
Product wcms
Weakness CWE-434 · Unrestricted file upload
Published October 3, 2026
Last update October 3, 2026

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

W (vincent-peugnet/wcms) through 3.18.0 contains a remote code execution vulnerability that allows authenticated editors to write arbitrary files by abusing the unvalidated path in POST /api/v0/media/upload/[*:path]. Attackers can upload .php files executed by the web server, use encoded ../ sequences to write outside the media directory, and delete arbitrary files via DELETE /api/v0/media/[*:path].

Key dates

02Disclosure timeline

October 3, 2026 CVE published

Related vulnerabilities

04Related CVE