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CVE-2020-1026
CRITICAL
A Security Feature Bypass vulnerability exists in the MSR JavaScript Cryptography Library that is caused by multiple bugs in the library’s Elliptic Curve Cryptography (ECC) implementation.An attacker could potentially abuse these bugs to learn information about a server’s private ECC key (a key leakage attack) or craft an invalid ECDSA signature that nevertheless passes as valid.The security update addresses the vulnerability by fixing the bugs disclosed in the ECC implementation, aka 'MSR JavaScript Cryptography Library Security Feature Bypass Vulnerability'.
Published: Apr 15, 2020
Modified: Jun 17, 2026
CWE-200
CWE-347
CVSS Metrics
CVSSv3
Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products (1)
| Vendor | Product | Version |
|---|---|---|
| microsoft | research_javascript_cryptography_library | 1.4 |
GitHub Security Advisory GHSA-9x9j-836w-8f55
Incorrect Calculation in the MSR JavaScript Cryptography Library
npm
msrcrypto
< 1.5.8
Fixed: 1.5.8
References (2)
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1026 Patch, Vendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1026 Patch, Vendor Advisory
Risk Scores
CVSS Score
9.8 / 10
EPSS Score
2.54%
Top 16% most likely to be exploited
Threat Score
40 / 100
Data Sources
NVD
EPSS
GitHub