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Vulnerability record · CVE-2023-5057 · published 16 October 2023

CVE-2023-5057: Automattic activitypub vulnerability

Automattic · Activitypub

The ActivityPub WordPress plugin before 1.0.0 does not escape user metadata before outputting them in mentions, which could allow users with a role of Contributor and above to perform Stored XSS attacks

5.4 CVSS 3.1 Medium EPSS 0.42% · top 66.2%
5.4CVSS 3.1 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

The ActivityPub WordPress plugin before 1.0.0 does not escape user metadata before outputting them in mentions, which could allow users with a role of Contributor and above to perform Stored XSS attacks

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

Affected products

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

References

LinkTags
https://wpscan.com/vulnerability/58a63507-f0fd-46f1-a80c-6b1c41dddcf5 ExploitThird Party Advisory
https://wpscan.com/vulnerability/58a63507-f0fd-46f1-a80c-6b1c41dddcf5 ExploitThird Party Advisory

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Related vulnerabilities

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

7.5CVE-2026-4338Automattic activitypub vulnerabilityThe ActivityPub WordPress plugin before 8.0.2 does not properly filter posts to be displayed, allowed unauthenticated users to access drafts/schedule…EPSS 0.44%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 0.50%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 0.57%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 0.57%

Source: NIST National Vulnerability Database (record CVE-2023-5057), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.