Privilege Escalation Vulnerability in Meta Box AIO Plugin for WordPress
CVE-2026-13355

9.8CRITICAL

Key Information:

Vendor

WordPress
Status
Meta Box Frontend Submission
Vendor
CVE Published:
22 September 2026

What is CVE-2026-13355?

The Meta Box AIO plugin for WordPress has a vulnerability that enables unauthenticated attackers to gain elevated privileges to Administrator. This is caused by a lack of authorization checks in the populate_via_query_string() function and insufficient role validation in the mb-user-profile component. Attackers can exploit this flaw to manipulate post content and perform unauthorized actions on WordPress sites, potentially compromising the entire site.

Affected Version(s)

Meta Box Frontend Submission 0 <= 4.5.6

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://metabox.io/changelog/
https://metabox.io/plugins/meta-box-aio/changelog/

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

h0xilo
.