CVE-2026-57311 Unrestricted Upload of File with Dangerous Type in Windu CMS
An authenticated attacker can upload arbitrary files, including PHP, to Windu CMS, leading to remote code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-57311?
CVE-2026-57311 is a medium-severity vulnerability in JCD Windu CMS, published on 20 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-434
Which versions are affected by CVE-2026-57311?
How do I fix CVE-2026-57311?
No fix has been published for CVE-2026-57311 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-57311 being exploited?
There is no known exploitation of CVE-2026-57311 in the wild and no public exploit code.
Sources
Also known as GHSA-m87v-9vv3-8824.