CVE-2019-16780

Summary

WordPress users with lower privileges (like contributors) can inject JavaScript code in the block editor using a specific payload, which is executed within the dashboard. This can lead to XSS if an admin opens the post in the editor. Execution of this attack does require an authenticated user. This has been patched in WordPress 5.3.1, along with all the previous WordPress versions from 3.7 to 5.3 via a minor release. Automatic updates are enabled by default for minor releases and we strongly recommend that you keep them enabled.

Impact & exploitability

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://github.com/WordPress/wordpress-develop/commit/505dd6a20b6fc3d06130018c1caeff764248c29e ↗

Additional information

• NVD record
• https://github.com/WordPress/wordpress-develop/commit/505dd6a20b6fc3d06130018c1caeff764248c29ePatch
• https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-x3wp-h3qx-9w94Advisory
• https://hackerone.com/reports/738644Advisory
• https://seclists.org/bugtraq/2020/Jan/8Advisory
• https://wordpress.org/news/2019/12/wordpress-5-3-1-security-and-maintenance-release/Advisory
• https://wpvulndb.com/vulnerabilities/9976Advisory
• https://www.debian.org/security/2020/dsa-4599Advisory
• https://www.debian.org/security/2020/dsa-4677Advisory