CVE-2020-4089: Hcltech Notes

Medium severity, CVSS 6.5. EPSS: 1.2% chance of exploitation in the next 30 days.

HCL Notes is vulnerable to an information leakage vulnerability through its support for the 'mailto' protocol. This vulnerability could result in files from the user's filesystem or connected network filesystems being leaked to a third party. All versions of HCL Notes 9, 10 and 11 are affected.

Affected products

• Hcltech Notes: version 9.0 only; version 10.0 only; version 11.0 only

Published 2020-06-26. Last modified 2026-06-17.