Vulnerability · Published Jul 20, 2026 · Assigned by CERT-PL

CVE-2026-57311Unrestricted Upload of File with Dangerous Type in Windu CMS

Medium 5.3

In plain English

A medium-severity unrestricted file upload in Windu CMS from JCD. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities).

Severity (CVSS 4.0)5.3Medium

Exploit odds (30 days)0.6%top 49.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Windu CMS does not validate types of uploaded files. An authenticated attacker can upload arbitrary files, including PHP. This can lead to Remote Code Execution. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 4.1 but may also affect other versions.

Affected products (as reported)

Vendor	Product	Versions
JCD	Windu CMS	4.1

Weakness: CWE-434 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L

References

https://cert.pl/posts/2026/07/CVE-2026-57309 third-party-advisory
https://windu.org product