CVE-2021-42564: Cryptshare Server

Medium severity, CVSS 5.4. EPSS: 0.7% chance of exploitation in the next 30 days.

An open redirect through HTML injection in confidential messages in Cryptshare before 5.1.0 allows remote attackers (with permission to provide confidential messages via Cryptshare) to redirect targeted victims to any URL via the '<meta http-equiv="refresh"' substring in the editor parameter.

Affected products

• Cryptshare Cryptshare Server: before 5.1.0 (fixed in 5.1.0)

Published 2021-11-30. Last modified 2026-06-17.