Improper Access Control in ActivityPub Plugin for WordPress
CVE-2026-4338

7.5HIGH

Key Information:

Vendor

WordPress
Status
Activitypub
Vendor
CVE Published:
8 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4338?

The ActivityPub WordPress plugin prior to version 8.0.2 contains a flaw that allows unauthenticated users to access sensitive content, including drafts, scheduled, and pending posts. This lack of proper filtering enables unauthorized visibility of unpublished materials, potentially leading to information exposure and compromising the integrity of content management.

Affected Version(s)

ActivityPub 0 < 8.0.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-4338 - Proof of Concept

References

https://wpscan.com/vulnerability/50f68395-72fc-4f99-8e6d-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ryuk (kos0ng)
WPScan
.