CVE-2026-86783

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

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

Post Grid Gutenberg Blocks

CVSS v3.1 CNA

5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

0.21% chance of exploitation in the next 30 days, 10th percentile

Published

2026-09-23

Proof-of-concept exploits (1)

• https://wpscan.com/vulnerability/719fc130-748b-4bad-8091-2858664299ed/

References

• CVE Record
• NVD entry