WordPress plugin
ActivityPub security & vulnerabilities
No known unpatched vulnerabilities in the latest version
All 6 known vulnerabilities are fixed in the latest release. If you run an older version, update to null or newer.
6Known vulnerabilities
- Critical0
- High1
- Medium5
- Low0
All ActivityPub vulnerabilities
Nothing in this view
No vulnerabilities match this filter. Show all.
ActivityPub: common questions
Does ActivityPub have known vulnerabilities?
Yes. VulnCrest Radar lists 6 known vulnerabilities in ActivityPub: 1 high, 5 medium. None are known to affect version null.
How do I check which version of ActivityPub I run?
In wp-admin open Plugins → Installed Plugins; the version is shown under the name. Without admin access, our passive Check my site tool can often read it from public files.
What is the most recent ActivityPub vulnerability?
CVE-2026-4338, published Mar 18, 2026: ActivityPub < 8.0.2 - Unauthenticated Information Epxosure. Severity: High (CVSS 7.5).
Is any ActivityPub vulnerability listed in CISA KEV?
No. None of the known ActivityPub vulnerabilities is currently listed in the CISA KEV catalog.