CVE-2026-0561 Details.
Shield Security <= 21.0.8 - Unauthenticated Reflected XSS
Atlas does not check this one. Works by exploiting the flaw.
The only reliable test for this one is to try the weakness itself, which can disturb the site. Atlas does not do that, so it does not run this check.
About CVE-2026-0561. What It Means.
Shield Security WordPress plugin <= 21.0.8 contains a reflected cross-site scripting caused by insufficient input sanitization and output escaping in the 'message' parameter, letting unauthenticated attackers inject scripts, exploit requires user interaction.
Affected Product. What Is Hit.
- Vendor
- wp-simple-firewall
- Product
- WP Simple Firewall Shield Security
FAQ
Common Questions.
Shield Security <= 21.0.8 - Unauthenticated Reflected XSS. Shield Security WordPress plugin <= 21.0.8 contains a reflected cross-site scripting caused by insufficient input sanitization and output escaping in the 'message' parameter, letting unauthenticated attackers inject scripts, exploit requires user interaction.
No. The only reliable test for this one is to try the weakness itself, which can disturb the site. Atlas does not do that, so it does not run this check. The facts about CVE-2026-0561 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
CVE-2026-0561 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing.
Update WP Simple Firewall Shield Security to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-0561. Atlas does not run a check for it, so nothing here says whether a particular site is affected.