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 Medium (4.3)
Publicly Published September 25, 2023
Last Updated January 22, 2024
Researcher Erwan LR
Description

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).

References

1 affected software package

Software Type Plugin
Software Slug activitypub (view on wordpress.org)
Patched? Yes
Affected Version
  • <= 0.17.0
Patched Version
  • 1.0.0
This record contains material that is subject to copyright

Copyright 2012-2026 Defiant Inc.
License: Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy. License Detail.