CVE-2021-39199GHSA-9Q5W-79CV-947M
Cross site scripting via unsafe defaults in remark-html
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 14.0.1, 13.0.2
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
remark-html is an open source nodejs library which compiles Markdown to HTML. In affected versions the documentation of remark-html has mentioned that it was safe by default. In practice the default was never safe and had to be opted into. That is, user input was not sanitized. This means arbitrary HTML can be passed through leading to potential XSS attacks. The problem has been patched in 13.0.2 and 14.0.1: `remark-html` is now safe by default, and the implementation matches the documentation. On older affected versions, pass `sanitize: true` if you cannot update.
Timeline
- CVE published
- Record last updated
Affected versions
- remarkjs remark-html
From 14.0.0 · fixed in 14.0.1; fixed in 13.0.2
- remark-htmlnpm
fixed in 13.0.2
- remark-htmlnpm
From 14.0.0 · fixed in 14.0.1