Arbitrary files disclosure in HCL Notes

Published: 2020-08-19
Risk Medium
Patch available NO
Number of vulnerabilities 1
CVE ID CVE-2020-4089
Exploitation vector Network
Public exploit N/A
Vulnerable software
HCL Notes
Client/Desktop applications / Office applications

Vendor HCL Technologies

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Input validation error

Risk: Medium

CVSSv3.1: 6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:U/RC:C] [PCI]

CVE-ID: CVE-2020-4089

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No


The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to insufficient validation of user-supplied input within the "mailto" URI handler. A remote attacker can trick the victim to click on a specially crafted "mailto" link and attack to the email arbitrary file from the victim's system without any additional warning.


Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

HCL Notes: 9.0.0, 9.0.1, 10.0.0, 10.0.1, 11.0.0, 11.0.1

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open an attachment in an e-mail message.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.