CVE-2021-47755

High · 7.5

CVSS

7.5

EPSS

0.8%

Published

Jan 15, 2026

CISA due date

—

The record

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.

Affected packages

Ecosystem	Package	Introduced	Fixed