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CVE-2021-26540

Good to know:

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Date: February 8, 2021

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".

Language: JS

Severity Score

Related Resources (5)

https://github.com/apostrophecms/sanitize-html/blob/main/CHANGELOG.md#232-2021-01-26
https://nvd.nist.gov/vuln/detail/CVE-2021-26540
https://github.com/apostrophecms/sanitize-html/pull/460
https://advisory.checkmarx.net/advisory/CX-2021-4309
https://www.mend.io/vulnerability-database/CVE-2021-26540

Severity Score

Weakness Type (CWE)

Input Validation

CWE-20

Insufficient Information

NVD-CWE-noinfo

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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