Medium 6.1Published Feb 18, 2026

CVE-2026-0561Shield Security <= 21.0.8 - Unauthenticated Reflected Cross-Site Scripting via 'message' Parameter

Updated under an hour ago (Oct 27, 2026, 10:50 AM ET)

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It affects paultgoodchild Shield: Blocks Bots, Protects Users, and Prevents Security Breaches. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for paultgoodchild Shield: Blocks Bots, Protects Users, and Prevents Security Breaches

Exploited in the last 30 days

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.

CVSS: 6.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Wordfence
NVD analysis: Deferred
Record last updated: Apr 8, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

paultgoodchild Shield: Blocks Bots, Protects Users, and Prevents Security Breaches paultgoodchild:shield_blocks_bots_protects_users_and_prevents_security_breaches (from the name)	through 21.0.8	CNA record

References

References

https://www.wordfence.com/threat-intel/vulnerabilities/id/cb49eb5f-c1ff-4440-8b53-c2515e65da27?source=cve
https://research.cleantalk.org/cve-2026-0561
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3439494%40wp-simple-firewall&new=3439494%40wp-simple-firewall&sfp_email=&sfph_mail=

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.