Arbitrary file upload in Vincent-Peugnet Wcms
CVE-2026-105123
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].
Vulnerability class: Unrestricted File Upload
Published .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/vincent-peugnet/wcms/issues/662 (issue-tracking)
- github.com/vincent-peugnet/wcms (product)
- github.com/vincent-peugnet/wcms/blob/cda5bcdb95dbdb1e804fdfe0e5fd2e2b2f8a90e2/a… (technical-description)
- github.com/vincent-peugnet/wcms/blob/cda5bcdb95dbdb1e804fdfe0e5fd2e2b2f8a90e2/a… (technical-description)
- www.vulncheck.com/advisories/w-wcms-through-3.18.0-rce-and-arbitrary-file-write… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-105123?
- CVE-2026-105123 is a high-severity vulnerability in Vincent-Peugnet Wcms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2026-10-04.
- How severe is CVE-2026-105123?
- High severity. CVSS v3 base score is 8.8 out of 10.