CVE Vulnerability

CVE-2021-26540

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".

5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

Scope

5.3 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://github.com/apostrophecms/sanitize-html/blob/main/CHANGELOG.md#232-2021-01-26 Release Notes Third Party Advisory
https://github.com/apostrophecms/sanitize-html/pull/460 Patch Third Party Advisory
https://advisory.checkmarx.net/advisory/CX-2021-4309 Exploit Patch
Configurations

Configuration 1

cpe:2.3:a:apostrophecms:sanitize-html:*:*:*:*:*:node.js:*:*
Information

Published : 2021-02-08 05:15

Updated : 2021-04-01 03:02

NVD link : CVE-2021-26540

Mitre link : CVE-2021-26540

Products Affected
No products.
CWE
NVD-CWE-noinfo