CVE-2026-0561

Shield Security <= 21.0.8 - Unauthenticated Reflected Cross-Site Scripting via 'message' Parameter

The Shield Security plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'message' parameter in all versions up to, and including, 21.0.8 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Affected

paultgoodchild · Shield: Blocks Bots, Protects Users, and Prevents Security Breaches

CVSS v3.1 WORDFENCE

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

EPSS

0.65% chance of exploitation in the next 30 days, 50th percentile

Nuclei

medium · CWE-79

Published

2026-02-19

Updated

2026-04-08

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-0561.yaml

References

• CVE Record
• NVD entry