What’s Vulnerable › Vulnerabilities

CVE-2022-21663: Authenticated Object Injection in Multisites in WordPress

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-01-06 · updated 2026-06-17
• Weakness: CWE-74

Description

WordPress is a free and open-source content management system written in PHP and paired with a MariaDB database. On a multisite, users with Super Admin role can bypass explicit/additional hardening under certain conditions through object injection. This has been patched in WordPress version 5.8.3. Older affected versions are also fixed via security release, that go back till 3.7.37. We strongly recommend that you keep auto-updates enabled. There are no known workarounds for this issue.

Affected products

• Debian Linux: 9.0, 10.0, 11.0
• Fedoraproject Fedora: 34, 35
• WordPress: before 5.8.3 — fixed in 5.8.3

How to fix

Upgrade to a fixed version: WordPress 5.8.3. Check the vendor advisory for mitigations.

References

• https://blog.sonarsource.com/wordpress-object-injection-vulnerability/
• https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-jmmq-m8p8-332h
• https://lists.debian.org/debian-lts-announce/2022/01/msg00019.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CV4UNEC63UU5GEU47IIR4RMTZAHNEOJG/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DM6XPH3JN6V4NF4WBOJTOXZIVE6VKKE3/
• https://wordpress.org/news/2022/01/wordpress-5-8-3-security-release/
• https://www.debian.org/security/2022/dsa-5039
• https://blog.sonarsource.com/wordpress-object-injection-vulnerability/
• https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-jmmq-m8p8-332h
• https://lists.debian.org/debian-lts-announce/2022/01/msg00019.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CV4UNEC63UU5GEU47IIR4RMTZAHNEOJG/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DM6XPH3JN6V4NF4WBOJTOXZIVE6VKKE3/

Get alerted when CVE-2022-21663 or the next vulnerability affects your stack