Authenticated XSS through embed block in WordPress

5.4 CVSS

Vulnerability 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).

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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Affected Vendor

WordPress

View all reports →

Affected Software

wordpress-develop

Vulnerable Versions:

>= 5.4.0, < 5.4.2, >= 5.3.0, < 5.3.4, >= 5.2.0, < 5.2.7, >= 5.1.0, < 5.1.6, >= 5.0.0, < 5.0.10, >= 4.9.0, < 4.9.15, >= 4.8.0, < 4.8.14, >= 4.7.0, < 4.7.18, >= 4.6.0, < 4.6.19, >= 4.5.0, < 4.5.22, >= 4.4.0, < 4.4.23, >= 4.3.0, < 4.3.24, >= 4.2.0, < 4.2.28, >= 4.1.0, < 4.1.31, >= 4.0.0, < 4.0.31, >= 3.9.0, < 3.9.32, >= 3.8.0, < 3.8.34, >= 3.7.0, < 3.7.34