CVE-2026-0561

MEDIUM

Shield Security Plugin <21.0.8 - XSS

Title source: llm

Description

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.

Exploits (1)

github WORKING POC

by Sechunt3r · shellpoc

https://github.com/Sechunt3r/CVE-POCs/tree/main/CVE-2026-0561

View Code ZIP pw:eip

References (3)

[Product] 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=

[Various Sources] https://research.cleantalk.org/cve-2026-0561

[Third Party Advisory] https://www.wordfence.com/threat-intel/vulnerabilities/id/cb49eb5f-c1ff-4440-8b53-c2515e65da27?source=cve

Scores

CVSS v3 6.1

EPSS 0.0010

EPSS Percentile 26.4%

Attack Vector NETWORK

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

Details

CWE

CWE-79

Status published

Products (1)

paultgoodchild/Shield: Blocks Bots, Protects Users, and Prevents Security Breaches < 21.0.8

Published Feb 19, 2026

Tracked Since Feb 19, 2026