Improper Input Validation in Sanitize-HTML by Apostrophe Technologies
CVE-2021-26540

5.3MEDIUM

Key Information:

Vendor

Apostrophecms

Status
Sanitize-html
Vendor
CVE Published:
8 February 2021

What is CVE-2021-26540?

The sanitize-html library by Apostrophe Technologies prior to version 2.3.2 has a vulnerability resulting from improper validation of hostnames specified by the 'allowedIframeHostnames' option when 'allowIframeRelativeUrls' is enabled. This flaw allows attackers to evade the hostname whitelist for iframe elements, enabling potential security risks through malicious iframe sources that could lead to exploitation.

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References

https://github.com/apostrophecms/sanitize-html/blob/main/...
x_refsource_MISC
https://github.com/apostrophecms/sanitize-html/pull/460
x_refsource_MISC
https://advisory.checkmarx.net/advisory/CX-2021-4309
x_refsource_MISC

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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