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.
- Critical0
- High1
- Medium5
- Low0
All ActivityPub vulnerabilities
| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.5 | Unauthenticated Information Epxosure <8.0.2Update to 8.0.2 | CVE-2026-4338 | |
| Medium5.3 | Missing Authorization ≤1.0.5Update to 1.0.6 | CVE-2023-52199 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting via Post Content ≤0.17.0Update to 1.0.0 | CVE-2023-3746 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting via User Metadata ≤0.17.0Update to 1.0.0 | CVE-2023-5057 | |
| Medium6.5 | Authenticated (Subscriber+) Insecure Direct Object Reference to Sensitive Post Content Exposure ≤0.17.0Update to 1.0.0 | CVE-2023-3707 | |
| Medium4.3 | Authenticated (Subscriber+) Insecure Direct Object Reference to Sensitive Post Title Exposure ≤0.17.0Update to 1.0.0 | CVE-2023-3706 |
- High7.5Unauthenticated Information Epxosure
<8.0.2Update to 8.0.2
- Medium5.3Missing Authorization
≤1.0.5Update to 1.0.6
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via Post Content
≤0.17.0Update to 1.0.0
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via User Metadata
≤0.17.0Update to 1.0.0
- Medium6.5Authenticated (Subscriber+) Insecure Direct Object Reference to Sensitive Post Content Exposure
≤0.17.0Update to 1.0.0
- Medium4.3Authenticated (Subscriber+) Insecure Direct Object Reference to Sensitive Post Title Exposure
≤0.17.0Update to 1.0.0
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.