Critical security advisoryCriticalFlagged by our vulnerability database: PHP2Shell is on CISA’s exploited list. Most WordPress hosting runs PHP. See if your site is affectedFlagged by our vulnerability database: PHP2Shell is being exploited. DetailsExploited: PHP2Shell. Check your site
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WordPress plugin · activitypub

Is ActivityPub safe?

Safe on 9.3.1 or newer.

The current version, 9.3.1, is past every affected range on record (6 of 6 records list one). Keep it updated and you’re clear of them.

Flaws on record
6
High or critical
1
Exploited
none
Current version
9.3.1
Last updated
Sep 2, 2026
Active installs
6,000+

Every recorded flaw

Records come from the National Vulnerability Database, published by the researchers who found each flaw (Wordfence, Patchstack, WPScan and others); exploited status from CISA; exploit odds from FIRST’s EPSS; current version, installs and closures from wordpress.org, checked daily. Want every plugin on your site checked at once? Run the free website check.

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