Quick answers
- Is CVE-2026-57311 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-57311 being exploited in the wild.
- How severe is CVE-2026-57311?
- Informational severity, with a CVSS score of 5.3, published 20 July 2026.
- Which products and versions are affected?
- JCD Windu CMS 4.1.
- Is there a fix for CVE-2026-57311?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-57311 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-57311?
- Check whether you run JCD Windu CMS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
Windu CMS (confirmed in version 4.1) suffers from an unrestricted file upload vulnerability (CWE-434). The application fails to validate the extensions or content types of files uploaded to the server. An authenticated attacker with basic privileges can upload arbitrary files, including PHP scripts, to a web-accessible directory. By subsequently requesting the uploaded file, the attacker can execute arbitrary code on the underlying server. While the vendor was contacted, no patch has been confirmed, and the vulnerability may persist in other versions.
Affected products
- JCD Windu CMS 4.1
Timeline
- 2026-07-20: disclosed: Vulnerability disclosed by CERT.PL
- 2026-07-20: advisory: CVE-2026-57311 published