{"cve":"CVE-2020-1026","nvd":{"published":"2020-04-15T15:15:20.967","modified":"2026-06-17T03:00:15.193","status":"Modified","description":"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'.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-200","CWE-347"],"references":["https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1026","https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1026"],"products":["microsoft:research_javascript_cryptography_library"],"source":"nvd","synced_at":"2026-10-19T21:04:18.695612450+00:00"},"epss":{"cve":"CVE-2020-1026","score":0.02605,"percentile":0.8538,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-9x9j-836w-8f55","url":"https://osv.dev/vulnerability/GHSA-9x9j-836w-8f55","summary":"Incorrect Calculation in the MSR JavaScript Cryptography Library","modified":"2023-11-08T04:01:57.734184Z","packages":[{"ecosystem":"npm","name":"msrcrypto","purl":"pkg:npm/msrcrypto","ranges":["<1.5.8"],"fixed":["1.5.8"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}