CVE-2021-26539

medium

Description

Apostrophe Technologies sanitize-html before 2.3.1 does not properly handle internationalized domain name (IDN) which could allow an attacker to bypass hostname whitelist validation set by the "allowedIframeHostnames" option.

References

Advisories
More

https://github.com/apostrophecms/sanitize-html/pull/458

https://github.com/apostrophecms/sanitize-html/blob/main/CHANGELOG.md#231-2021-01-22

https://advisory.checkmarx.net/advisory/CX-2021-4308

Details

Source: Mitre, NVD

Published: 2021-02-08

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 5.3

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N