What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-04 · updated 2026-10-06
• Weakness: CWE-434

Description

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].

Affected products

• vincent-peugnet wcms: through 3.18.0

References

• https://github.com/vincent-peugnet/wcms
• https://github.com/vincent-peugnet/wcms/blob/cda5bcdb95dbdb1e804fdfe0e5fd2e2b2f8a90e2/app/class/Controllerapimedia.php#L24-L44
• https://github.com/vincent-peugnet/wcms/blob/cda5bcdb95dbdb1e804fdfe0e5fd2e2b2f8a90e2/app/class/Media.php#L98
• https://github.com/vincent-peugnet/wcms/issues/662
• https://www.vulncheck.com/advisories/w-wcms-through-3.18.0-rce-and-arbitrary-file-write-via-media-upload-api

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