CVE-2019-20374

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.

Category

9.6
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 3.0 •
CVSS 2.0 •
EPSS 2.17% Top 20%
Third-Party Advisory github.com Third-Party Advisory github.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/typora/typora-issues/issues/3124 third party advisory
https://github.com/cure53/DOMPurify/commit/4e8af7b2c4a159b683d317e02c5cbddb86dc4a0e third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2019-20374?
CVE-2019-20374 has been scored as a critical severity vulnerability.
How to fix CVE-2019-20374?
To fix CVE-2019-20374, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-20374 being actively exploited in the wild?
It is possible that CVE-2019-20374 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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