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Vulnerability record · CVE-2026-4338 · published 8 April 2026

CVE-2026-4338: Automattic activitypub vulnerability

Automattic · Activitypub

The ActivityPub WordPress plugin before 8.0.2 does not properly filter posts to be displayed, allowed unauthenticated users to access drafts/scheduled/pending posts

7.5 CVSS 3.1 High EPSS 0.44% · top 64.4%
7.5CVSS 3.1 base score
0.44%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
24 Jul 2026Last modified by NVD

Description

The ActivityPub WordPress plugin before 8.0.2 does not properly filter posts to be displayed, allowed unauthenticated users to access drafts/scheduled/pending posts

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://wpscan.com/vulnerability/50f68395-72fc-4f99-8e6d-6aa90cc640b5/ Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

5.4CVE-2023-5057Automattic activitypub vulnerabilityThe ActivityPub WordPress plugin before 1.0.0 does not escape user metadata before outputting them in mentions, which could allow users with a role o…EPSS 0.42%5.4CVE-2023-3746Automattic activitypub vulnerabilityThe ActivityPub WordPress plugin before 1.0.0 does not sanitize and escape some data from post content, which could allow contributor and above role …EPSS 0.43%4.3CVE-2023-3706Automattic activitypub vulnerabilityThe ActivityPub WordPress plugin before 1.0.0 does not ensure that post titles to be displayed are public and belong to the plugin, allowing any auth…EPSS 0.47%4.3CVE-2023-3707Automattic activitypub vulnerabilityThe 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 au…EPSS 0.47%

Source: NIST National Vulnerability Database (record CVE-2026-4338), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.