Is CVE-2021-26540 actively exploited?

CVE-2021-26540 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2021-26540?

CVE-2021-26540 has a CVSS score of 5.3 (MEDIUM severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

How do I patch CVE-2021-26540?

Patch guidance is available from apostrophecms security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-26540.

Which products are affected by CVE-2021-26540?

1 product: apostrophecms sanitize-html.

CVE-2021-26540 - remediation guidance & executive summary

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".

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: low
Availability: none
Weaknesses: NVD-CWE-noinfo

Metadata

Primary Vendor: APOSTROPHECMS
Published: 2/8/2021
Last Modified: 11/21/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2021-26540

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary