An issue was discovered in FileChucker 4.99e-free-e02. filechucker.cgi has a filter bypass that allows a malicious user to upload any type of file by using % characters within the extension, e.g., file.%ph%p becomes file.php.
Severity
CVSS 3.0
7.8 high
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
2.0% chance of exploitation in the next 30 days; higher than 80% of CVEs (scores of 2026-10-31)