CVE-2026-4338: Automattic Activitypub

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

The ActivityPub WordPress plugin before 8.0.2 does not properly filter posts to be displayed, allowed unauthenticated users to access drafts/scheduled/pending posts

Affected products

• Automattic Activitypub: before 8.0.2 (fixed in 8.0.2)

Published 2026-04-08. Last modified 2026-07-24.