Vulnerability · Published Sep 23, 2026 · Assigned by WPScan

CVE-2026-86783PostX < 5.0.41 - Unauthenticated Custom Field Key Disclosure via REST API

Medium 5.3

In plain English

A medium-severity information exposure in Post Grid Gutenberg Blocks from Unknown. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.3%top 71.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

The Post Grid Gutenberg Blocks WordPress plugin before 5.0.41 does not perform an authorization or post-visibility check on a REST API route that returns the custom field keys of a given post, allowing unauthenticated users to disclose the custom field key names of arbitrary posts, including private, draft, pending, scheduled and password-protected posts.

Affected products (as reported)

Vendor	Product	Versions
Unknown	Post Grid Gutenberg Blocks	0 – before 5.0.41

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

https://wpscan.com/vulnerability/719fc130-748b-4bad-8091-2858664299ed/ exploit, vdb-entry, technical-description