Improper Input Validation in sanitize-html

GHSA-mjxr-4v3x-q3m4 · CVE-2021-26540

Published May 6, 2021 · Modified Nov 8, 2023

Description

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".

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-26540
WEB 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

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