ActivityPub <= 0.17.0 - Authenticated (Subscriber+) Insecure Direct Object Reference to Sensitive Post Title Exposure

Authorization Bypass Through User-Controlled Key
CVE CVE-2023-3706
CVSS 4.3 (Medium)
Publicly Published September 25, 2023
Last Updated January 22, 2024
Researcher Erwan LR - WPScan


The ActivityPub plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to, and including, 0.17.0 due to missing validation on a user controlled key. This can allow authenticated attackers, with subscriber-level permissions and above, to expose potentially sensitive post titles (e.g., draft and private post titles).



1 affected software package

Software Type Plugin
Software Slug activitypub (view on
Patched? Yes
Remediation Update to version 1.0.0, or a newer patched version
Affected Version
  • <= 0.17.0
Patched Version
  • 1.0.0

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