CVE-2023-3707: ActivityPub for WordPress < 1.0.0 - Subscriber+ Arbitrary Post Content Disclosure

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-10-16 · updated 2026-06-17

Description

The ActivityPub WordPress plugin before 1.0.0 does not ensure that post contents to be displayed are public and belong to the plugin, allowing any authenticated user, such as subscriber to retrieve the content of arbitrary post (such as draft and private) via an IDOR vector. Password protected posts are not affected by this issue.

Affected products

ActivityPub: before 1.0.0 — fixed in 1.0.0

How to fix

Upgrade to a fixed version: ActivityPub 1.0.0. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/541bbe4c-3295-4073-901d-763556269f48
https://wpscan.com/vulnerability/541bbe4c-3295-4073-901d-763556269f48

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