VulnerabilityDeferred

CVE-2026-57311

An authenticated attacker can upload arbitrary files, including PHP.

MEDIUM 5.3EPSS 0.63%

Does this matter?

Lower severity and a low EPSS score (0.63%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 4.0: 5.3 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.63% probability · 48th percentile
CISA KEV: Not listed
Weakness: CWE-434
Source: cvd@cert.pl

References

https://cert.pl/posts/2026/07/CVE-2026-57309
https://windu.org

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.