What’s Vulnerable › Vulnerabilities

CVE-2023-5057: ActivityPub for WordPress < 1.0.0 - Contributor+ Stored XSS

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% 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 escape user metadata before outputting them in mentions, which could allow users with a role of Contributor and above to perform Stored XSS attacks

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/58a63507-f0fd-46f1-a80c-6b1c41dddcf5
• https://wpscan.com/vulnerability/58a63507-f0fd-46f1-a80c-6b1c41dddcf5

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