CVE-2019-20374

CRITICAL EPSS 81.1%
Published Jan 9, 20206y ago · Modified Jun 17, 20262w ago
9.6 CVSS 3.1
Critical
Find Similar
Published Jan 9, 2020 6y ago
Last Modified Jun 17, 2026 2w ago

Description

A mutation cross-site scripting (XSS) issue in Typora through 0.9.9.31.2 on macOS and through 0.9.81 on Linux leads to Remote Code Execution through Mermaid code blocks. To exploit this vulnerability, one must open a file in Typora. The XSS vulnerability is then triggered due to improper HTML sanitization. Given that the application is based on the Electron framework, the XSS leads to remote code execution in an unsandboxed environment.

CVSS Details

Base Score
9.6
Exploitability
2.8
Impact
6.0
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Changed
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
81.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 4

VendorProductVersionRange
typoratypora* ≤0.9.81
linuxlinux_kernel*any
typoratypora* ≤0.9.9.31.2
applemacos*any

References 2

  • github.com https://github.com/cure53/DOMPurify/commit/4e8af7b2c4a159b683d317e02c5cbddb86dc4a0e
    PatchThird Party Advisory
  • github.com https://github.com/typora/typora-issues/issues/3124
    Third Party Advisory

Remediation

  • github.com https://github.com/cure53/DOMPurify/commit/4e8af7b2c4a159b683d317e02c5cbddb86dc4a0e
    PatchThird Party Advisory