CVE-2022-21663Network attack vector

Authenticated object injection in multisites

Published Jan 6, 2022 · Updated Apr 22, 2025

Object injection in WordPress before 5.8.3 allows remote authenticated users with Super Admin privileges to bypass multisite hardening. The public records identify object injection in multisite handling but do not disclose a specific function or unsafe operation. Exploitation requires a multisite deployment and Super Admin access, with potential confidentiality, integrity, and availability impact.

CVSS severity6.6
Medium
EPSS probability3.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Object injection in WordPress before 5.8.3 allows remote authenticated users with Super Admin privileges to bypass multisite hardening. The public records identify object injection in multisite handling but do not disclose a specific function or unsafe operation. Exploitation requires a multisite deployment and Super Admin access, with potential confidentiality, integrity, and availability impact.

The record

CVE
CVE-2022-21663
Published
Jan 6, 2022
Updated
Apr 22, 2025
Vendor
WordPress.org
Product
WordPress
Classifications
CWE-74, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 6, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 5.8.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

WordPress.org · WordPressversion=< 5.8.3

Published CVSS scores

6.6GitHub CNACVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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