Security Feature Bypass in Microsoft MSR JavaScript Cryptography Library

Published: 2020-04-14
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-1026
Exploitation vector Network
Public exploit N/A
Vulnerable software
MSR JavaScript Cryptography Library
Universal components / Libraries / Libraries used by multiple products

Vendor Microsoft

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Security Features

EUVDB-ID: #VU26887

Risk: High

CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-1026

CWE-ID: CWE-254 - Security Features

Exploit availability: No


This vulnerability allows a local user to bypass security rescritions feature.

The vulnerability exists in the MSR JavaScript Cryptography Library due to multiple bugs in the library’s Elliptic Curve Cryptography (ECC) implementation. A remote attacker can gain information about a server’s private ECC key (a key leakage attack) or craft an invalid ECDSA signature that nevertheless passes as valid.


Install updates from vendor's website.

Vulnerable software versions

MSR JavaScript Cryptography Library: All versions

CPE2.3 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.

Is there known malware, which exploits this vulnerability?

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