CVE intelligence and bounded remediation

CVE-2020-35938 — Pickplugins Post Grid security vulnerability

High CVSS 8.8

PHP Object injection vulnerabilities in the Post Grid plugin before 2.0.73 for WordPress allow remote authenticated attackers to inject arbitrary PHP objects due to insecure unserialization of data supplied in a remotely hosted crafted payload in the source parameter via AJAX. The action must be set to post_grid_import_xml_layouts.

Severity
High
CVSS
8.8 (3.1)
Published
2021-01-01
CISA KEV
Not currently listed
Ecosystem
php/wordpress
Weaknesses
CWE-502

Affected products

  • pickplugins / post_grid
  • pickplugins / team_showcase

Matched remediation archetype

Unsafe deserialization and object reconstruction

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Check exposure

  • Inventory serialization formats accepted from requests, queues, caches, files, cookies, and cross-service messages.
  • Trace whether untrusted input can select classes, types, callbacks, constructors, or object hooks during decoding.
  • Identify signing, schema validation, trust-boundary, and compatibility settings for each decoder.

Remediate safely

  • Replace native object deserialization with a data-only format and explicit schema validation.
  • If replacement is not immediate, use a safe decoder with a minimal type allowlist and disable polymorphic or executable hooks.
  • Update the affected library and add inert tests for unknown types, extra fields, malformed nesting, and unsigned data.

Authoritative sources

Complete CVE record and remediation plan

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