CVE-2021-39199
This means arbitrary HTML can be passed through leading to potential XSS attacks.
Does this matter?
Lower severity and a low EPSS score (1.07%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 1.07% probability · 63th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- remark/remark-html
- Source
- security-advisories@github.com
References
- https://github.com/remarkjs/remark-html/commit/b75c9dde582ad87ba498e369c033dc8a350478c1Patch, Third Party Advisory
- https://github.com/remarkjs/remark-html/releases/tag/14.0.1Patch, Release Notes, Third Party Advisory
- https://github.com/remarkjs/remark-html/security/advisories/GHSA-9q5w-79cv-947mPatch, Third Party Advisory
- https://www.npmjs.com/package/remark-htmlProduct, Third Party Advisory
- https://github.com/remarkjs/remark-html/commit/b75c9dde582ad87ba498e369c033dc8a350478c1Patch, Third Party Advisory
- https://github.com/remarkjs/remark-html/releases/tag/14.0.1Patch, Release Notes, Third Party Advisory
- https://github.com/remarkjs/remark-html/security/advisories/GHSA-9q5w-79cv-947mPatch, Third Party Advisory
- https://www.npmjs.com/package/remark-htmlProduct, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.