ActivityPub vulnerabilities
Plugin slug activitypub · 6 known vulnerabilities · latest disclosed 2026-03-18 · WordPress.org page
Every listed vulnerability has a fix. Version 8.0.2 or later is not affected by any of them. If your site runs an older version, update it.
1 of 6 rated high or critical (CVSS 7 or more).
Known vulnerabilities in ActivityPub
| Severity | Affected versions | Fixed in | CVE | Published | Details |
|---|---|---|---|---|---|
| High 7.5 | < 8.0.2 | 8.0.2 | CVE-2026-4338 | 2026-03-18 | Advisory |
| Medium 5.3 | <= 1.0.5 | 1.0.6 | CVE-2023-52199 | 2024-01-05 | Advisory |
| Medium 6.4 | <= 0.17.0 | 1.0.0 | CVE-2023-3746 | 2023-09-25 | Advisory |
| Medium 6.4 | <= 0.17.0 | 1.0.0 | CVE-2023-5057 | 2023-09-25 | Advisory |
| Medium 6.5 | <= 0.17.0 | 1.0.0 | CVE-2023-3707 | 2023-09-25 | Advisory |
| Medium 4.3 | <= 0.17.0 | 1.0.0 | CVE-2023-3706 | 2023-09-25 | Advisory |
Check if a site is affected
Enter a site address to see which version of ActivityPub and other plugins it runs, and whether they match a known vulnerability.
Questions
Is the ActivityPub plugin safe to use?
All 6 known issues are fixed in current versions (8.0.2 or later). Keeping it updated is what matters.
How do I check which version of ActivityPub my site runs?
In WordPress go to Plugins > Installed Plugins. From the outside, the free PluginPeek scan below reads the version from the site's public files.
How do I fix a vulnerable plugin?
Make a full backup, then update it from Dashboard > Updates and check the site afterwards. If you would rather not, we can do it for a fixed $99, paid after you have checked the site.