CVE-2021-47755 HIGH

CVE-2021-47755: Oliver Library Server v5 - Arbitrary File Download

Vendor Softlink Education
Product Oliver Library Server
Weakness CWE-22 · Path traversal
Published January 15, 2026
Last update April 7, 2026
View on NVD All CVEs

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

01Description

Oliver Library Server v5 contains a file download vulnerability that allows unauthenticated attackers to access arbitrary system files through unsanitized input in the FileServlet endpoint. Attackers can exploit the vulnerability by manipulating the 'fileName' parameter to download sensitive files from the server's filesystem.

Key dates

02Disclosure timeline

January 15, 2026 CVE published
April 7, 2026 Record updated