An issue in the fileMd5 parameter in the /a/file/upload endpoint of JeeSite v5.15.1 allows authenticated attackers with file upload permissions to execute a path traversal and write arbitrary files with whitelisted suffixes to arbitrary filesystem locations while chunked upload is enabled.
Severity
CVSS 3.1
9.6 critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
EPSS
0.4% chance of exploitation in the next 30 days; higher than 32% of CVEs (scores of 2026-10-31)