title: Authenticated XSS through embed block in WordPress
description: In affected versions of WordPress, users with low privileges (like contributors and authors) can use the embed block in a certain way to inject unfiltered HTML in the block editor. When affected posts are viewed by a higher privileged user, this could lead to script execution in the editor/wp-admin. This has been patched in version 5.4.2, along with all the previously affected versions via a minor release (5.3.4, 5.2.7, 5.1.6, 5.0.10, 4.9.15, 4.8.14, 4.7.18, 4.6.19, 4.5.22, 4.4.23, 4.3.24, 4.2.28, 4.1.31, 4.0.31, 3.9.32, 3.8.34, 3.7.34).
problem types: CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
affected:
{
product: wordpress-develop
vendor: WordPress
versions:
status: affected, version: >= 5.4.0, < 5.4.2
status: affected, version: >= 5.3.0, < 5.3.4
status: affected, version: >= 5.2.0, < 5.2.7
status: affected, version: >= 5.1.0, < 5.1.6
status: affected, version: >= 5.0.0, < 5.0.10
status: affected, version: >= 4.9.0, < 4.9.15
status: affected, version: >= 4.8.0, < 4.8.14
status: affected, version: >= 4.7.0, < 4.7.18
status: affected, version: >= 4.6.0, < 4.6.19
status: affected, version: >= 4.5.0, < 4.5.22
status: affected, version: >= 4.4.0, < 4.4.23
status: affected, version: >= 4.3.0, < 4.3.24
status: affected, version: >= 4.2.0, < 4.2.28
status: affected, version: >= 4.1.0, < 4.1.31
status: affected, version: >= 4.0.0, < 4.0.31
status: affected, version: >= 3.9.0, < 3.9.32
status: affected, version: >= 3.8.0, < 3.8.34
status: affected, version: >= 3.7.0, < 3.7.34
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 5.4
baseSeverity: MEDIUM
confidentialityImpact: LOW
integrityImpact: LOW
privilegesRequired: LOW
scope: CHANGED
userInteraction: REQUIRED
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
version: 3.1
]