by Automattic 4.9 (40 reviews)

ActivityPub

Name: ActivityPub
Rating: 4.9 (40 reviews)
Author: Automattic

Connect your site to the Open Social Web and let millions of users follow, share, and interact with your content from Mastodon, Pixelfed, and more.

ActivityPub ranks #2,760 among WordPress.org plugins with 6,000+ active installations, a 4.9/5 rating from 40 reviews, and was last updated Sep 2, 2026. Data from WordPress.org, refreshed twice daily — see methodology.

Compatible with WP 7.1

v9.3.1 Current Version v9.3.1

Updated 1 week ago Last Update on 02 Sep, 2026

Refreshed 6 hours ago Last Refreshed on

Top 5% by installs Downloads -88.1% this week Actively maintained

View on WordPress.org

Rank

#2,760

— No change

Active Installs

6K+

-13%

KW Avg Position

1.8

— No change

Downloads

587K

+395 today

Support Resolved

75%

— No change

Rating

98%

Review 4.9 out of 5

4.9 (40 reviews)

Next Milestone 7K

Total Progress 87.6%

6K+ 7K+

Ranks to Climb

Growth Needed

8,000,000

Active Installs

Pro

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Need 124 more installs to reach 7K+

Rank Changes

Current #2,760

Change

Best #

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Active Installs Growth

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Active Installs 0,000,000+

Growth +0.0%

Peak 0,000,000

Downloads Growth

Downloads

Growth

Peak

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Reviews & Ratings

4.9

40 reviews

Overall 98%

36 (90%)

3 (8%)

1 (3%)

0 (0%)

Support Threads Overview

Resolved

Unresolved

Total Threads

Resolved

Unresolved

75%

Resolution Rate

Security History

Source: WPVulnerability

6 known vulnerabilities on record · 1 in the last 24 months · checked 2 days ago

Mar 18, 2026

ActivityPub [activitypub] < 8.0.2

CVE-2026-4338 · Fixed in v8.0.2
Jan 5, 2024

ActivityPub [activitypub] < 1.0.6

CVE-2023-52199 · Fixed in v1.0.6
Sep 25, 2023

ActivityPub [activitypub] < 1.0.1

CVE-2023-3746 · Fixed in v1.0.1
Sep 25, 2023

ActivityPub [activitypub] < 1.0.0

CVE-2023-3706 · Fixed in v1.0.0
Sep 25, 2023

ActivityPub [activitypub] < 1.0.0

CVE-2023-5057 · Fixed in v1.0.0
Sep 25, 2023

ActivityPub [activitypub] < 1.0.0

CVE-2023-3707 · Fixed in v1.0.0

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Plugin Details

Version: 9.3.1
Last Updated: Sep 02, 2026
Requires WP: 6.5+
Tested Up To: 7.1
PHP Version: 7.4 or higher
Author: Automattic

Support & Rating

Rating: ★ ★ ★ ★ ★ 4.9
Reviews: 40
Support Threads: 8
Resolved: 75%

Keywords

activitypub activitystream fediverse indieweb social web

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TL;DR

AI summary of the plugin's readme

This plugin is for WordPress site owners and bloggers who want their blog to reach fediverse users on platforms like Mastodon and Pixelfed. It solves the problem of connecting WordPress content to federated social networks so posts can be followed, shared, and commented on outside the blog itself.

Blog-wide federated profile
Per-author federated profiles
Mastodon integration
Pleroma/Akkoma integration
Friendica integration
Pixelfed integration
Delayed cron post delivery
Follower comments and updates

Frequently Asked Questions

Common questions about ActivityPub

ActivityPub for WordPress adds Fediverse features to WordPress, but it is not a replacement for platforms like Friendica or Mastodon. If you're looking to host a decentralized social network, consider using Mastodon or Friendica.

No. A crossposter pushes copies of your posts to a separate account you already have on someone else's server. ActivityPub for WordPress does the opposite: it makes your own site a first-class Fediverse account (@you@example.com), so people follow your site directly and replies come back as WordPress comments, with no second account required. The plugin will not add crossposting to an existing account; that is a deliberate choice, not a missing feature. If you would rather mirror articles to an established Mastodon account, that is a job for a dedicated crossposter plugin.

The name ActivityPub comes from the two core ideas behind the protocol: Activity: It is based on the concept of activities, like "Create", "Like", "Follow", "Announce", etc. These are structured messages (usually in ActivityStreams format) that describe what users do on the network. Pub: Short for publish or publication. It refers to the fact that this is a publish-subscribe (pub-sub) protocol — one user can "follow" another, and receive their published activities. Put together, ActivityPub is a protocol for publishing and subscribing to activities, which enables decentralized social networking — where different servers can interact and users can follow each other across the Fediverse.

We have an FAQ section in the docs directory with checklists for the most common problems — for example follow requests stuck on "pending" and comments from the Fediverse not showing up — and a How-To section in the docs directory for configuring specific setups. Constants The plugin uses PHP Constants to enable, disable or change its default behaviour. Please use them with caution and only if you know what you are doing. ACTIVITYPUB_REST_NAMESPACE - Change the default Namespace of the REST endpoint. Default: activitypub/1.0. ACTIVITYPUB_EXCERPT_LENGTH - Change the length of the Excerpt. Default: 400. ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS - Change the number of attachments, that should be federated. Default: 4. ACTIVITYPUB_HASHTAGS_REGEXP - Change the default regex to detect hashtext in a text. Default: (?:(?<=\s)|(?<=<p>)|(?<=<br>)|^)#([A-Za-z0-9_]+)(?:(?=\s|[[:punct:]]|$)). ACTIVITYPUB_USERNAME_REGEXP - Change the default regex to detect @-replies in a text. Default: (?:([A-Za-z0-9\._-]+)@((?:[A-Za-z0-9_-]+\.)+[A-Za-z]+)). ACTIVITYPUB_URL_REGEXP - Change the default regex to detect urls in a text. Default: (www.|http:|https:)+[^\s]+[\w\/]. ACTIVITYPUB_CUSTOM_POST_CONTENT - Change the default template for Activities. Default: <strong>[ap_title]</strong>\n\n[ap_content]\n\n[ap_hashtags]\n\n[ap_shortlink]. ACTIVITYPUB_AUTHORIZED_FETCH - Enable AUTHORIZED_FETCH. ACTIVITYPUB_DISABLE_REWRITES - Disable auto generation of mod_rewrite rules. Default: false. ACTIVITYPUB_DISABLE_INCOMING_INTERACTIONS - Block incoming replies/comments/likes. Default: false. ACTIVITYPUB_DISABLE_OUTGOING_INTERACTIONS - Disable outgoing replies/comments/likes. Default: false. ACTIVITYPUB_DISABLE_REMOTE_CACHE - Disable remote media caching (avatars, media, emoji). Default: false. Replaces ACTIVITYPUB_DISABLE_SIDELOADING from 7.9.1. ACTIVITYPUB_SHARED_INBOX_FEATURE - Enable the shared inbox. Default: false. ACTIVITYPUB_SEND_VARY_HEADER - Enable to send the Vary: Accept header. Default: false.

If you have activated the blog user, you will find the list of his followers in the settings under /wp-admin/options-general.php?page=activitypub&tab=followers. The followers of a user can be found in the menu under "Users" -> "Followers" or under wp-admin/users.php?page=activitypub-followers-list. For reasons of data protection, it is not possible to see the followers of other users.