MEDIUM5.3

GHSA-mjxr-4v3x-q3m4

Improper Input Validation in sanitize-html

Quick fix

GHSA-mjxr-4v3x-q3m4 — sanitize-html: upgrade to the fixed version with the command below.

npm install sanitize-html@2.3.2

Details

Apostrophe Technologies sanitize-html before 2.3.2 does not properly validate the hostnames set by the "allowedIframeHostnames" option when the "allowIframeRelativeUrls" is set to true, which allows attackers to bypass hostname whitelist for iframe element, related using an src value that starts with "/\\example.com".

Are you affected?

Enter the version of the package you're using.

Affected packages

npm/sanitize-html

Introduced in: 0Fixed in: 2.3.2

Fixnpm install sanitize-html@2.3.2

References

https://nvd.nist.gov/vuln/detail/CVE-2021-26540[ADVISORY]
https://github.com/apostrophecms/sanitize-html/pull/460[WEB]
https://advisory.checkmarx.net/advisory/CX-2021-4309[WEB]
https://github.com/apostrophecms/sanitize-html/blob/main/CHANGELOG.md#232-2021-01-26[WEB]