CVE intelligence and bounded remediation

CVE-2021-24859 — User Meta Shortcodes Project User Meta Shortcodes security vulnerability

Medium CVSS 4.3

The User Meta Shortcodes WordPress plugin through 0.5 registers a shortcode that allows any user with a role as low as contributor to access other users metadata by specifying the user login as a parameter. This makes the WP instance vulnerable to data extrafiltration, including password hashes

Severity
Medium
CVSS
4.3 (3.1)
Published
2021-12-13
CISA KEV
Not currently listed
Ecosystem
php/wordpress
Weaknesses
CWE-284

Affected products

  • user_meta_shortcodes_project / user_meta_shortcodes

Matched remediation archetype

Authorization bypass, IDOR, and cross-tenant access

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Check exposure

  • Map object and action authorization checks across API, UI, batch, import/export, and background-job paths.
  • Identify tenant, ownership, role, and policy boundaries for affected resources and administrative operations.
  • Use synthetic fixtures to compare intended access matrices without accessing another user's real data.

Remediate safely

  • Enforce server-side authorization at each resource access and state transition using the authenticated principal and trusted tenant context.
  • Scope data queries by tenant and ownership; treat client-supplied identifiers, roles, and policy claims as untrusted.
  • Add deny-by-default policy tests for horizontal and vertical access across every affected transport.

Authoritative sources

Complete CVE record and remediation plan

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